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Example: Configuring MPLS LSP Link Protection
date_range
04-Aug-23
Figure 1: MPLS LSP Link Protection Topology
Diagram
In Figure 1, a primary
MPLS LSP is established from Router 1 through Router 3 to
destination Router 2. To implement link protection, include the link-protection statement on the primary LSP at the ingress
point and on the appropriate downstream RSVP interfaces you wish to
protect. In this case, the primary LSP named Protected_LSP on Router 1 requires link protection, as does the so-7/3/2 RSVP interface of Router 1 and the so-6/0/0 RSVP
interface of Router 3. After link protection is enabled for the
protected LSP, bypass LSPs are established automatically for the LSP-traversed
interfaces of Routers 1 and 3.
On Router 1, configure an interior gateway
protocol (IGP) routing protocol (in this case, IS-IS), RSVP, and MPLS
on the so-0/0/0 and so-7/3/2 interfaces. Next,
configure the primary LSP on Router 1 to point to the loopback
address of Router 2. The primary LSP’s strict path must
travel though Router 3.
Enable link protection on both the LSP itself and
the outgoing RSVP interface traversed by the primary LSP (in this
case, the so-7/3/2 RSVP interface of Router 1). After
you enable link protection, the router notices that the primary LSP
is protected and prepares a bypass LSP.
Configure a static route of 10.31.5.1 in the LSP on Router 1. You can use this route for testing
purposes. Also, if you want to enable Packet Forwarding Engine local
repair, establish a policy that requires all traffic to use per-packet
load balancing. Once this policy is configured, export it to the neighboring
routers with the export statement at the [edit routing-options
forwarding-table] hierarchy level.
Router 1
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[edit]
interfaces {
so-0/0/0 {
unit 0 {
family inet {
address 10.31.3.1/30;
}
family iso;
family mpls;
}
}
so-7/3/2 {
unit 0 {
family inet {
address 10.31.1.1/30;
}
family iso;
family mpls;
}
}
lo0 {
unit 0 {
family inet {
address 10.245.71.51/32;
}
family iso {
}
}
}
protocols {
rsvp {
interface so-7/3/2.0 {
link-protection; # Enable link protection on the interface carrying the main LSP.
}
interface so-0/0/0.0 {
}
mpls {
label-switched-path Protected_LSP {
to 10.245.71.52;
install 10.31.5.1/32 active; # This route is used for testing the LSPs.
link-protection; # Enable link protection on the protected LSP.
primary path1;
}
path path1 {
10.31.1.2 strict;
}
interface so-0/0/0.0;
interface so-7/3/2.0;
}
isis {
level 2 wide-metrics-only;
interface so-0/0/0.0 {
level 1 disable;
level 2 {
metric 100;
te-metric 100;
}
}
interface so-7/3/2.0 {
level 1 disable;
level 2 {
metric 10;
te-metric 10;
}
}
interface lo0.0 {
passive;
}
}
}
routing-options {
forwarding-table { # Apply this policy to the forwarding table only
export pplb; # if Packet Forwarding Engine local repair is needed.
}
}
policy-options {
policy-statement pplb {
then {# Configure this policy only if
load-balance per-packet; # Packet Forwarding Engine local repair is needed.
}
}
}
}
}
On Router 2, no link protection configuration is needed. However, you should configure MPLS, RSVP, and IS-IS to communicate with the other routers.
Router 2
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interfaces {
so-0/0/0 {
unit 0 {
family inet {
address 10.31.3.2/30;
}
family iso;
family mpls;
}
}
so-7/1/0 {
unit 0 {
family inet {
address 10.31.2.1/30;
}
family iso;
family mpls;
}
}
lo0 {
unit 0 {
family inet {
address 10.245.71.53/32;
}
family iso {
}
}
}
protocols {
rsvp {
interface so-0/0/0.0;
interface so-7/1/0.0;
}
mpls {
interface so-0/0/0.0;
interface so-7/1/0.0;
}
isis {
level 2 wide-metrics-only;
interface so-0/0/0.0 {
level 1 disable;
level 2 {
metric 100;
te-metric 100;
}
}
interface so-7/1/0.0 {
level 1 disable;
level 2 {
metric 10;
te-metric 10;
}
}
interface lo0.0 {
passive;
}
}
}
}
On Router 3, include IS-IS, RSVP, and MPLS on the so-1/0/0 and so-6/0/0 interfaces. Enable link protection on the
remaining RSVP interface traversed by the primary LSP (in this case,
the so-6/0/0 RSVP interface). After you enable link protection,
the router notices the primary LSP is protected and prepares a bypass
LSP.
To enable Packet Forwarding Engine local repair, establish a policy that requires traffic to use per-packet load balancing. Once this policy is configured, export it to the neighboring routers.
Router 3
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[edit]
interfaces {
so-1/0/0 {
unit 0 {
family inet {
address 10.31.1.2/30;
}
family iso;
family mpls;
}
}
so-6/0/0 {
unit 0 {
family inet {
address 10.31.2.2/30;
}
family iso;
family mpls;
}
}
lo0 {
unit 0 {
family inet {
address 10.245.271.53/32;
}
family iso {
}
}
}
protocols {
rsvp {
interface so-1/0/0.0;
interface so-6/0/0.0 { # Primary interface going to Router 2.
link-protection;
}
}
mpls {
interface so-1/0/0.0;
interface so-6/0/0.0;
}
isis {
level 2 wide-metrics-only;
interface so-1/0/0.0 {
level 1 disable;
level 2 {
metric 10;
te-metric 10;
}
}
interface so-6/0/0.0 {
level 1 disable;
level 2 {
metric 10;
te-metric 10;
}
}
interface lo0.0 {
passive;
}
}
}
policy-options {
policy-statement pplb {
then {
load-balance per-packet; # If Packet Forwarding Engine local repair is needed.
}
}
}
routing-options {
forwarding-table {
export pplb; # If Packet Forwarding Engine local repair is needed.
}
}
}
Verifying Your Work
To verify proper operation of MPLS LSP link protection, use the following commands:
show mpls lspshow routeshow route forwarding-tableshow rsvp interface detailshow rsvp neighbor detailshow rsvp session detail
The following sections show the output of these commands used with the configuration example:
- Case 1: Normal Operation
- Case 2: When the Link from Router 1 to Router 3 Is Disabled
- Case 3: When the Link from Router 3 to Router 2 Is Disabled
Case 1: Normal Operation
Once link protection is enabled on the required RSVP interfaces and primary LSP, the bypass LSPs are prepared.
Router 1
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user@Router1> show mpls lsp Ingress LSP: 1 sessions To From State Rt ActivePath P LSPname 10.245.71.52 10.245.71.51 Up 1 path1 * Protected_LSP
This is the main LSP.
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Total 1 displayed, Up 1, Down 0 Egress LSP: 0 sessions Total 0 displayed, Up 0, Down 0 Transit LSP: 1 sessions To From State Rt Style Labelin Labelout LSPname 10.245.71.52 10.245.271.53 Up 1 1 SE 100003 0 Bypass->10.31.2.1
This is the bypass LSP from Router 3 to Router 2.
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Total 1 displayed, Up 1, Down 0 user@Router1> show rsvp session detail Ingress RSVP: 2 sessions 10.245.71.52 From: 10.245.71.51, LSPstate: Up, ActiveRoute: 1 LSPname: Protected_LSP
This is the main LSP. Notice that a backup LSP is not signaled when the main LSP is still up.
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Resv style: 1 SE, Label in: -, Label out: 100007 Time left: -, Since: Thu Aug 8 12:13:24 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 2 receiver 33 protocol 0 Link protection desired Type: Link protected LSP PATH rcvfrom: localclient PATH sentto: 10.31.1.2 (so-7/3/2.0) 36 pkts RESV rcvfrom: 10.31.1.2 (so-7/3/2.0) 38 pkts Explct route: 10.31.1.2 10.31.2.1 Record route: <self> 10.31.1.2 10.31.2.1 10.245.271.53 From: 10.245.71.51, LSPstate: Up, ActiveRoute: 0 LSPname: Bypass->10.31.1.2
This is the bypass from Router 1 to Router 2.
This also appears in the show mpls lsp command output above.
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Resv style: 1 SE, Label in: -, Label out: 100000
Time left: -, Since: Thu Aug 8 12:14:31 2002
Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500
Port number: sender 1 receiver 51 protocol 0
Type: Bypass LSP
PATH rcvfrom: localclient
PATH sentto: 10.31.3.2 (so-0/0/0.0) 32 pkts
RESV rcvfrom: 10.31.3.2 (so-0/0/0.0) 32 pkts
Explct route: 10.31.3.2 10.31.2.2
Record route: <self> 10.31.3.2 10.31.2.2
Total 2 displayed, Up 2, Down 0
Egress RSVP: 0 sessions
Total 0 displayed, Up 0, Down 0
Transit RSVP: 1 sessions
10.245.71.52
From: 10.245.271.53, LSPstate: Up, ActiveRoute: 1
LSPname: Bypass->10.31.2.1
Resv style: 1 SE, Label in: 100003, Label out: 0
Time left: 52, Since: Thu Aug 8 12:03:27 2002
Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500
Port number: sender 1 receiver 19 protocol 0
PATH rcvfrom: 10.31.1.2 (so-7/3/2.0) 76 pkts
PATH sentto: 10.31.3.2 (so-0/0/0.0) 77 pkts
RESV rcvfrom: 10.31.3.2 (so-0/0/0.0) 78 pkts
Explct route: 10.31.3.2
Record route: 10.31.1.2 <self> 10.31.3.2
Total 1 displayed, Up 1, Down 0
user@Router1> show rsvp interface detail
RSVP interface: 2 active
fxp0.0 Index 1, State Dis/Up
NoAuthentication, NoAggregate, NoReliable, NoLinkProtection
HelloInterval 9(second)
Address 192.168.71.52
PacketType Total Last 5 seconds
Sent Received Sent Received
Path 0 0 0 0
PathErr 0 0 0 0
PathTear 0 0 0 0
Resv 0 0 0 0
ResvErr 0 0 0 0
ResvTear 0 0 0 0
Hello 0 0 0 0
Ack 0 0 0 0
Srefresh 0 0 0 0
EndtoEnd RSVP 0 0 0 0
so-0/0/0.0 Index 8, State Ena/Up
NoAuthentication, NoAggregate, NoReliable, NoLinkProtection
HelloInterval 20(second)
Address 10.31.3.1, 10.245.71.51
ActiveResv 2, PreemptionCnt 0, Update threshold 10%
Subscription 100%, StaticBW 622.08Mbps, AvailableBW 622.08Mbps
PacketType Total Last 5 seconds
Sent Received Sent Received
Path 441 0 0 0
PathErr 0 0 0 0
PathTear 3 0 0 0
Resv 0 431 0 0
ResvErr 0 0 0 0
ResvTear 0 0 0 0
Hello 489 487 0 0
Ack 0 0 0 0
Srefresh 0 0 0 0
EndtoEnd RSVP 0 0 0 0
so-7/3/2.0 Index 11, State Ena/Up
NoAuthentication, NoAggregate, NoReliable, LinkProtection
Link protection is enabled.
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HelloInterval 3(second)
Address 10.31.1.1, 10.245.71.51
ActiveResv 1, PreemptionCnt 0, Update threshold 10%
Subscription 100%, StaticBW 2.48832Gbps, AvailableBW 2.48832Gbps
PacketType Total Last 5 seconds
Sent Received Sent Received
Path 225 138 0 0
PathErr 12 4 0 0
PathTear 5 3 0 0
Resv 134 216 0 1
ResvErr 0 0 0 0
ResvTear 3 1 0 0
Hello 750 799 1 1
Ack 0 0 0 0
Srefresh 0 0 0 0
EndtoEnd RSVP 0 0 0 0
user@Router1> show rsvp neighbor detail
RSVP neighbor: 2 learned
Address: 10.31.1.2 via: so-7/3/2.0 status: Up
Last changed time: 38:17, Idle: 5 sec, Up cnt: 1, Down cnt: 0
Message received: 329
Hello: sent 747, received: 747, interval: 3 sec
Remote instance: 0x41b21a47, Local instance: 0x238fa919
Refresh reduction: not operational
Link protection: enabled # This should be enabled
LSP name: Bypass->10.31.1.2
Bypass LSP: operational, Backup routes: 2 , Backup LSPs: 0
The number of backup routes equals 2 because the main LSP is already considered for protection.
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Bypass explicit route: 10.31.3.2 10.31.2.2
Address: 10.31.3.2 via: so-0/0/0.0 status: Up
Last changed time: 17:46, Idle: 5 sec, Up cnt: 4, Down cnt: 3
Message received: 430
Hello: sent 506, received: 486, interval: 20 sec
Remote instance: 0x194fa7af, Local instance: 0x507b7c2a
Refresh reduction: not operational
Link protection: disabled
Bypass LSP: does not exist, Backup routes: 0, Backup LSPs: 0
user@Router1>show route 10.31.5.1 extensive
inet.0: 24 destinations, 24 routes (22 active, 0 holddown, 2 hidden)
10.31.5.1/32 (1 entry, 1 announced)
State: <FlashAll>
TSI:
KRT in-kernel 10.31.5.1/32 -> {0.0.0.0, 0.0.0.0}
*RSVP Preference: 7
Next hop: via so-7/3/2.0 weight 1, selected
This is the main LSP.
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Label-switched-path Protected_LSP
Label operation: Push 100007
Next hop: via so-0/0/0.0 weight 20001
This is a backup route, though the backup LSP has not been signaled yet.
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Label-switched-path Bypass->10.31.1.2
Label operation: Push 100007, Push 100000(top)[0]
State: <Active Int>
Local AS: 69
Age: 8:34 Metric: 20
Task: RSVP
Announcement bits (1): 0-KRT
AS path: I
user@Router1> show route forwarding-table destination 10.31.5.1 extensive
Routing table: inet [Index 0]
Internet:
Destination: 10.31.5.1/32
Route type: user Route reference: 0
Flags: sent to PFE
Next-hop type: unilist Index: 39 Reference: 1
Next-hop type: Push 100007
Next-hop interface: so-7/3/2.0 Weight: 1
Packet Forwarding Engine local repair is enabled
(otherwise, only one entry appears for Next-hop).
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Next-hop type: Push 100007, Push 100000(top)[0] Next-hop interface: so-0/0/0.0 Weight: 20001
The Weight value for the backup starts at 20000 .
Router 3
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user@Router3> show mpls lsp Ingress LSP: 0 sessions
The ingress bypass LSP to Router 2 does not appear here.
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Total 0 displayed, Up 0, Down 0 Egress LSP: 1 sessions To From State Rt Style Labelin Labelout LSPname 10.245.271.53 10.245.71.51 Up 0 1 SE 3 - Bypass->10.31.1.2 Total 1 displayed, Up 1, Down 0 Transit LSP: 1 sessions To From State Rt Style Labelin Labelout LSPname 10.245.71.52 10.245.71.51 Up 1 1 SE 100000 0 Protected_LSP Total 1 displayed, Up 1, Down 0 user@Router3> show rsvp session detail Ingress RSVP: 1 sessions 10.245.71.52 From: 10.245.271.53, LSPstate: Up, ActiveRoute: 0 LSPname: Bypass->10.31.2.1
This is the ingress bypass session to Router 2 from Router 1.
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Suggested label received: -, Suggested label sent: - Recovery label received: -, Recovery label sent: 100004 Resv style: 1 SE, Label in: -, Label out: 100004 Time left: -, Since: Thu Aug 8 12:27:07 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 1 receiver 16 protocol 0 Type: Bypass LSP PATH rcvfrom: localclient PATH sentto: 10.31.1.1 (so-1/0/0.0) 3 pkts RESV rcvfrom: 10.31.1.1 (so-1/0/0.0) 3 pkts Explct route: 10.31.1.1 10.31.3.2 Record route: <self> 10.31.1.1 10.31.3.2 Total 1 displayed, Up 1, Down 0 Egress RSVP: 1 sessions 10.245.271.53 From: 10.245.71.51, LSPstate: Up, ActiveRoute: 0 LSPname: Bypass->10.31.1.2
This is the bypass from Router 1 to Router 3, arriving by way of Router 2.
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Suggested label received: -, Suggested label sent: - Recovery label received: -, Recovery label sent: - Resv style: 1 SE, Label in: 3, Label out: - Time left: 54, Since: Thu Aug 8 12:26:48 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 1 receiver 52 protocol 0 PATH rcvfrom: 10.31.2.1 (so-6/0/0.0) 5 pkts PATH sentto: localclient RESV rcvfrom: localclient Record route: 10.31.3.1 10.31.2.1 <self> Total 1 displayed, Up 1, Down 0 Transit RSVP: 1 sessions 10.245.71.52 From: 10.245.71.51, LSPstate: Up, ActiveRoute: 1 LSPname: Protected_LSP
This is the main LSP.
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Suggested label received: -, Suggested label sent: -
Recovery label received: -, Recovery label sent: 0
Resv style: 1 SE, Label in: 100000, Label out: 0
Time left: 41, Since: Thu Aug 8 12:26:39 2002
Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500
Port number: sender 2 receiver 33 protocol 0
Link protection desired
Type: Link protected LSP
PATH rcvfrom: 10.31.1.1 (so-1/0/0.0) 9 pkts
PATH sentto: 10.31.2.1 (so-6/0/0.0) 11 pkts
RESV rcvfrom: 10.31.2.1 (so-6/0/0.0) 10 pkts
Explct route: 10.31.2.1
Record route: 10.31.1.1 <self> 10.31.2.1
Total 1 displayed, Up 1, Down 0
user@Router3> show rsvp neighbor detail
RSVP neighbor: 2 learned
Address: 10.31.2.1 via: so-6/0/0.0 status: Up
Last changed time: 27, Idle: 0 sec, Up cnt: 1, Down cnt: 0
Message received: 19
Hello: sent 6, received: 6, interval: 9 sec
Remote instance: 0x625d2852, Local instance: 0x327317df
Refresh reduction: not operational
Link protection: enabled
LSP name: Bypass->10.31.2.1
Bypass LSP: operational, Backup routes: 1 , Backup LSPs: 0
The number of backup routes is 1.
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Bypass explicit route: 10.31.1.1 10.31.3.2
Address: 10.31.1.1 via: so-1/0/0.0 status: Up
Last changed time: 41, Idle: 0 sec, Up cnt: 1, Down cnt: 0
Message received: 15
Hello: sent 17, received: 17, interval: 3 sec
Remote instance: 0x2ebdcf43, Local instance: 0x643d9e23
Refresh reduction: not operational
Link protection: disabled
Bypass LSP: does not exist, Backup routes: 0, Backup LSPs: 0
user@Router3> show rsvp interface detail
RSVP interface: 2 active
fxp0.0 Index 1, State Dis/Up
NoAuthentication, NoAggregate, NoReliable, NoLinkProtection
HelloInterval 9(second)
Address 192.168.6.64
PacketType Total Last 5 seconds
Sent Received Sent Received
Path 0 0 0 0
PathErr 0 0 0 0
PathTear 0 0 0 0
Resv 0 0 0 0
ResvErr 0 0 0 0
ResvTear 0 0 0 0
Hello 0 0 0 0
Ack 0 0 0 0
Srefresh 0 0 0 0
EndtoEnd RSVP 0 0 0 0
so-1/0/0.0 Index 6, State Ena/Up
NoAuthentication, NoAggregate, NoReliable, NoLinkProtection
HelloInterval 3(second)
Address 10.31.1.2, 10.245.271.53
ActiveResv 1, PreemptionCnt 0, Update threshold 10%
Subscription 100%, StaticBW 2.48832Gbps, AvailableBW 2.48832Gbps
PacketType Total Last 5 seconds
Sent Received Sent Received
Path 5 14 0 1
PathErr 0 0 0 0
PathTear 0 0 0 0
Resv 8 9 0 0
ResvErr 0 0 0 0
ResvTear 0 0 0 0
Hello 23 25 2 2
Ack 0 0 0 0
Srefresh 0 0 0 0
EndtoEnd RSVP 0 0 0 0
so-6/0/0.0 Index 9, State Ena/Up
NoAuthentication, NoAggregate, NoReliable, LinkProtection
Link protection is enabled.
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HelloInterval 9(second)
Address 10.31.2.2, 10.245.271.53
ActiveResv 1, PreemptionCnt 0, Update threshold 10%
Subscription 100%, StaticBW 9.95328Gbps, AvailableBW 9.95328Gbps
PacketType Total Last 5 seconds
Sent Received Sent Received
Path 12 8 0 0
PathErr 0 0 0 0
PathTear 0 1 0 0
Resv 9 14 0 1
ResvErr 0 0 0 0
ResvTear 0 0 0 0
Hello 8 8 1 1
Ack 0 0 0 0
Srefresh 0 0 0 0
EndtoEnd RSVP 0 0 0 0
user@Router3> show route forwarding-table family mpls
Routing table: ccc
MPLS:
Destination Type RtRef Next hop Type Index NhRef Netif
default perm 0 dscd 1 1
0 user 0 recv 3 3
1 user 0 recv 3 3
2 user 0 recv 3 3
100000 user 0 ulst 77 1
This is the main LSP.
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Swap 0 so-6/0/0.0
Swap 100004[0] so-1/0/0.0
100000(S=0) user 0 ulst 78 1
Pop so-6/0/0.0
Swap 100004[0] so-1/0/0.0
100007 user 0 ulst 71 1
This is the bypass LSP from Router 1 to Router 2.
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Swap 0 so-6/0/0.0
Swap 100003[0] so-1/0/0.0
100007(S=0) user 0 ulst 73 1
Pop so-6/0/0.0
Swap 100003[0] so-1/0/0.0
Case 2: When the Link from Router 1 to Router 3 Is Disabled
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[edit] user@Router1# set interfaces so-7/3/2 disable [edit] user@Router1# commit commit complete
The primary interface from Router 1 to Router 3 is disabled.
Router 1
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user@Router1> show mpls lsp Ingress LSP: 1 sessions To From State Rt ActivePath P LSPname 10.245.71.52 10.245.71.51 Up 0 path1 * Protected_LSP
The main LSP is up.
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Total 1 displayed, Up 1, Down 0 Egress LSP: 0 sessions Total 0 displayed, Up 0, Down 0 Transit LSP: 1 sessions To From State Rt Style Labelin Labelout LSPname 10.245.71.52 10.245.271.53 Up 0 1 SE 100004 0 Bypass->10.31.2.1
This is the bypass LSP from Router 3 to Router 2.
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Total 1 displayed, Up 1, Down 0 user@Router1> show rsvp session detail Ingress RSVP: 3 sessions 10.245.71.52 From: 10.31.3.1, LSPstate: Up, ActiveRoute: 0 LSPname: Protected_LSP
This is the newly signaled backup LSP, as indicated by the To/From field.
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Resv style: 1 SE, Label in: -, Label out: 100000 Time left: -, Since: Thu Aug 8 12:29:16 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 2 receiver 33 protocol 0 Link protection desired Type: Backup LSP at Point-of-Local-Repair PATH rcvfrom: localclient PATH sentto: 10.31.1.2 (so-0/0/0.0) 4 pkts RESV rcvfrom: 10.31.2.2 (so-0/0/0.0) 3 pkts Explct route: 10.31.2.2 10.31.2.1 Record route: <self> 10.31.2.2 10.31.2.1 10.245.71.52 From: 10.245.71.51, LSPstate: Dn, ActiveRoute: 0
The original LSP is now down.
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LSPname: Protected_LSP Resv style: 0 -, Label in: -, Label out: - Time left: -, Since: Thu Aug 8 12:13:24 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 2 receiver 33 protocol 0 Link protection desired Type: Link protected LSP PATH rcvfrom: localclient PATH sentto: [no route] Explct route: 10.31.1.2 10.31.2.1 Record route: <self> ...incomplete 10.245.271.53 From: 10.245.71.51, LSPstate: Up, ActiveRoute: 1 LSPname: Bypass->10.31.1.2
This is the bypass LSP from Router 1 to Router 2.
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Resv style: 1 SE, Label in: -, Label out: 100001 Time left: -, Since: Thu Aug 8 12:26:48 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 1 receiver 52 protocol 0 Type: Bypass LSP PATH rcvfrom: localclient PATH sentto: 10.31.3.2 (so-0/0/0.0) 13 pkts RESV rcvfrom: 10.31.3.2 (so-0/0/0.0) 13 pkts Explct route: 10.31.3.2 10.31.2.2 Record route: <self> 10.31.3.2 10.31.2.2 Total 3 displayed, Up 2, Down 1 Egress RSVP: 0 sessions Total 0 displayed, Up 0, Down 0 Transit RSVP: 1 sessions 10.245.71.52 From: 10.245.271.53, LSPstate: Up, ActiveRoute: 0 LSPname: Bypass->10.31.2.1
This is the bypass LSP from Router 3 to Router 2, which will fail in the next case.
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Resv style: 1 SE, Label in: 100004, Label out: 0 Time left: 38, Since: Thu Aug 8 12:27:07 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 1 receiver 16 protocol 0 PATH rcvfrom: 10.31.1.2 (so-7/3/2.0) 11 pkts PATH sentto: 10.31.3.2 (so-0/0/0.0) 12 pkts RESV rcvfrom: 10.31.3.2 (so-0/0/0.0) 12 pkts Explct route: 10.31.3.2 Record route: 10.31.1.2 <self> 10.31.3.2 Total 1 displayed, Up 1, Down 0 user@Router1> show rsvp neighbor detail RSVP neighbor: 2 learned Address: 10.31.1.2 via: so-7/3/2.0 status: Down
The neighbor is down.
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Last changed time: 25, Idle: 25 sec, Up cnt: 2, Down cnt: 2
Message received: 397
Hello: sent 900, received: 890, interval: 3 sec
Remote instance: 0x0, Local instance: 0x41b41b17
Refresh reduction: not operational
Link protection: enabled
LSP name: Bypass->10.31.1.2
Bypass LSP: operational, Backup routes: 2, Backup LSPs: 1
Bypass explicit route: 10.31.3.2 10.31.2.2
Address: 10.31.3.2 via: so-0/0/0.0 status: Up
Last changed time: 25:40, Idle: 5 sec, Up cnt: 4, Down cnt: 3
Message received: 502
Hello: sent 558, received: 538, interval: 20 sec
Remote instance: 0x194fa7af, Local instance: 0x507b7c2a
Refresh reduction: not operational
Link protection: disabled
Bypass LSP: does not exist, Backup routes: 0, Backup LSPs: 0
user@Router1> show route 10.31.5.1
inet.0: 23 destinations, 23 routes (22 active, 0 holddown, 1 hidden)
+ = Active Route, - = Last Active, * = Both
10.31.5.1/32 *[RSVP/7] 00:03:04, metric 20
> via so-0/0/0.0, label-switched-path Bypass->10.31.1.2The route can be reached by way of the backup LSP.
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user@Router1> show route forwarding-table destination 10.31.5.1 Routing table: inet Internet: Destination Type RtRef Next hop Type Index NhRef Netif 10.31.5.1/32 user 0 Push 100000, Push 100001(top)[0] so-0/0/0.0
Double-stacked labels appear on the backup LSP from Router 1 to Router 2 to Router 3.
Before proceeding to Case 3, reenable the so-7/3/2 interface on Router 1.
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[edit] user@Router1# delete interfaces so-7/3/2 disable [edit] user@Router1# commit commit complete
Case 3: When the Link from Router 3 to Router 2 Is Disabled
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[edit] user@Router3# set interfaces so-6/0/0 disable [edit] user@Router3# commit commit complete
The primary interface from Router 3 to Router 2 is disabled.
Router 3
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user@Router3> show rsvp session Ingress RSVP: 2 sessions To From State Rt Style Labelin Labelout LSPname 10.245.71.52 10.245.271.53 Up 1 1 SE - 100005 Bypass->10.31.2.1 10.245.71.52 10.31.1.2 Up 0 1 SE - 0 Protected_LSP
The backup is signaled from Router 3 to Router 2.
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Total 2 displayed, Up 2, Down 0 Egress RSVP: 1 sessions To From State Rt Style Labelin Labelout LSPname 10.245.271.53 10.245.71.51 Up 0 1 SE 3 - Bypass->10.31.1.2 Total 1 displayed, Up 1, Down 0 Transit RSVP: 1 sessions To From State Rt Style Labelin Labelout LSPname 10.245.71.52 10.245.71.51 Dn 0 0 - 100000 - Protected_LSP
The main LSP is down.
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Total 1 displayed, Up 0, Down 1 user@Router3> show rsvp session detail Ingress RSVP: 2 sessions 10.245.71.52 From: 10.245.271.53, LSPstate: Up, ActiveRoute: 1 LSPname: Bypass->10.31.2.1 Suggested label received: -, Suggested label sent: - Recovery label received: -, Recovery label sent: 100005 Resv style: 1 SE, Label in: -, Label out: 100005 Time left: -, Since: Thu Aug 8 12:31:09 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 1 receiver 17 protocol 0 Type: Bypass LSP PATH rcvfrom: localclient PATH sentto: 10.31.1.1 (so-1/0/0.0) 6 pkts RESV rcvfrom: 10.31.1.1 (so-1/0/0.0) 6 pkts Explct route: 10.31.1.1 10.31.3.2 Record route: <self> 10.31.1.1 10.31.3.2 10.245.71.52 From: 10.31.1.2, LSPstate: Up, ActiveRoute: 0 LSPname: Protected_LSP Suggested label received: -, Suggested label sent: - Recovery label received: -, Recovery label sent: 0 Resv style: 1 SE, Label in: -, Label out: 0 Time left: -, Since: Thu Aug 8 12:31:59 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 2 receiver 33 protocol 0 Link protection desired Type: Backup LSP at Point-of-Local-Repair
This is the backup LSP.
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PATH rcvfrom: localclient PATH sentto: 10.31.2.1 (so-1/0/0.0) 5 pkts RESV rcvfrom: 10.31.3.2 (so-1/0/0.0) 2 pkts Explct route: 10.31.3.2 Record route: <self> 10.31.3.2 Total 2 displayed, Up 2, Down 0 Egress RSVP: 1 sessions 10.245.271.53 From: 10.245.71.51, LSPstate: Up, ActiveRoute: 0 LSPname: Bypass->10.31.1.2 Suggested label received: -, Suggested label sent: - Recovery label received: -, Recovery label sent: - Resv style: 1 SE, Label in: 3, Label out: - Time left: 31, Since: Thu Aug 8 12:26:48 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 1 receiver 52 protocol 0 PATH rcvfrom: 10.31.2.1 (so-6/0/0.0) 23 pkts PATH sentto: localclient RESV rcvfrom: localclient Record route: 10.31.3.1 10.31.2.1 <self> Total 1 displayed, Up 1, Down 0 Transit RSVP: 1 sessions 10.245.71.52 From: 10.245.71.51, LSPstate: Dn, ActiveRoute: 0 LSPname: Protected_LSP Suggested label received: -, Suggested label sent: - Recovery label received: -, Recovery label sent: - Resv style: 0 -, Label in: 100000, Label out: - Time left: 53, Since: Thu Aug 8 12:26:39 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 2 receiver 33 protocol 0 Link protection desired Type: Link protected LSP PATH rcvfrom: 10.31.1.1 (so-1/0/0.0) 30 pkts PATH sentto: [no route] Explct route: 10.31.2.1 Record route: 10.31.1.1 <self> ...incomplete Total 1 displayed, Up 0, Down 1 user@Router3> show route forwarding-table family mpls Routing table: ccc MPLS: Destination Type RtRef Next hop Type Index NhRef Netif default perm 0 dscd 1 1 0 user 0 recv 3 3 1 user 0 recv 3 3 2 user 0 recv 3 3 100000 user 0 Swap 100005[0] so-1/0/0.0
This shows label swapping for the main LSP traveling over the backup LSP through Router 2.
Router 1
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user@Router1> show rsvp session detail Ingress RSVP: 1 sessions 10.245.71.52 From: 10.245.71.51, LSPstate: Up, ActiveRoute: 1 LSPname: Protected_LSP
The main LSP is not affected.
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Resv style: 1 SE, Label in: -, Label out: 100000 Time left: -, Since: Thu Aug 8 12:13:24 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 2 receiver 33 protocol 0 Link protection desired PATH rcvfrom: localclient PATH sentto: 10.31.1.2 (so-7/3/2.0) 95 pkts RESV rcvfrom: 10.31.1.2 (so-7/3/2.0) 87 pkts Explct route: 10.31.1.2 10.31.2.1 Record route: <self> 10.31.1.2 10.31.3.2 Total 1 displayed, Up 1, Down 0 Egress RSVP: 0 sessions Total 0 displayed, Up 0, Down 0 Transit RSVP: 1 sessions 10.245.71.52 From: 10.245.271.53, LSPstate: Up, ActiveRoute: 0 LSPname: Bypass->10.31.2.1
The bypass LSP is listed, because Router 1 does not detect the backup from Router 3 to Router 2.
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Resv style: 1 SE, Label in: 100005, Label out: 0 Time left: 53, Since: Thu Aug 8 12:31:09 2002 Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500 Port number: sender 1 receiver 17 protocol 0 PATH rcvfrom: 10.31.1.2 (so-7/3/2.0) 11 pkts PATH sentto: 10.31.3.2 (so-0/0/0.0) 11 pkts RESV rcvfrom: 10.31.3.2 (so-0/0/0.0) 11 pkts Explct route: 10.31.3.2 Record route: 10.31.1.2 <self> 10.31.3.2 Total 1 displayed, Up 1, Down 0 user@Router1> show route forwarding-table family mpls Routing table: ccc MPLS: Destination Type RtRef Next hop Type Index NhRef Netif default perm 0 dscd 8 1 0 user 0 recv 10 3 1 user 0 recv 10 3 2 user 0 recv 10 3 100005 user 0 Swap 0 so-0/0/0.0
Labels are swapped on the bypass LSP.
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100005(S=0) user 0 Pop so-0/0/0.0 user@Router1> show route forwarding-table destination 10.31.5.1 extensive Routing table: inet [Index 0] Internet: Destination: 10.31.5.1/32 Route type: user Route reference: 0 Flags: sent to PFE Next-hop type: Push 100000
There is only one entry here. The bypass to Router 3 is broken because the connection between Router 3 and Router 2 is disabled.
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Next-hop interface: so-7/3/2.0
user@Router1> show isis adjacency
Interface System L State Hold (secs) SNPA
so-0/0/0.0 Router2 2 Up 24
so-7/3/2.0 Router3 2 Up 23
user@Router1> show route 10.31.5.1 extensive
inet.0: 22 destinations, 22 routes (21 active, 0 holddown, 1 hidden)
10.31.5.1/32 (1 entry, 1 announced)
State: <FlashAll>
TSI:
KRT in-kernel 10.31.5.1/32 -> {0.0.0.0}
*RSVP Preference: 7
Next hop: via so-7/3/2.0 weight 1, selected
Only one entry is shown.
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Label-switched-path Protected_LSP
Label operation: Push 100000
State: <Active Int>
Local AS: 69
Age: 2:21 Metric: 100
Task: RSVP
Announcement bits (1): 0-KRT
AS path: I
user@Router1> show rsvp neighbor detail
RSVP neighbor: 2 learned
Address: 10.31.1.2 via: so-7/3/2.0 status: Up
Last changed time: 2:58, Idle: 0 sec, Up cnt: 3, Down cnt: 2
Message received: 433
Hello: sent 965, received: 950, interval: 3 sec
Remote instance: 0x74be7c42, Local instance: 0x41b41b17
Refresh reduction: not operational
Link protection: disabled
Bypass LSP: does not exist, Backup routes: 0, Backup LSPs: 0
Address: 10.31.3.2 via: so-0/0/0.0 status: Up
Last changed time: 30:54, Idle: 0 sec, Up cnt: 4, Down cnt: 3
Message received: 533
Hello: sent 593, received: 573, interval: 20 sec
Remote instance: 0x194fa7af, Local instance: 0x507b7c2a
Refresh reduction: not operational
Link protection: disabled
Bypass LSP: does not exist, Backup routes: 0, Backup LSPs: 0
user@Router1> show rsvp session
Ingress RSVP: 1 sessions
To From State Rt Style Labelin Labelout LSPname
10.245.71.52 10.245.71.51 Up 1 1 SE - 100000 Protected_LSP
Total 1 displayed, Up 1, Down 0
Egress RSVP: 0 sessions
Total 0 displayed, Up 0, Down 0
Transit RSVP: 1 sessions
To From State Rt Style Labelin Labelout LSPname
10.245.71.52 10.245.271.53 Up 0 1 SE 100005 0
Bypass->10.31.2.1
Total 1 displayed, Up 1, Down 0
