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Configuring GRE Keepalive Time
You can configure the keepalives on a GRE tunnel interface by including both the keepalive-time statement and the hold-time statement at the [edit protocols oam gre-tunnel interface interface-name] hierarchy level.
 | Note: For proper operation of keepalives on a GRE interface, you must also include the family inet statement at the [edit interfaces interface-name unit unit] hierarchy level. If you do not include this statement, the interface is marked as down. |
To configure keepalive time for a GRE tunnel interface:
- At the [edit interfaces interface-name unit unit-number] hierarchy level, set
the family as inet.user@host# set interfaces interface-name unit unit-number family family-name
- Configure the Operation, Administration, and Maintenance
(OAM) protocol:[edit]user@host# edit protocols oam
- Configure the GRE tunnel interface:[edit protocols oam]user@host# edit gre-tunnel interface interface-name
- Configure the keepalive time:[edit protocols oam gre-tunnel interface interface-name]user@host# set keepalive-time seconds
- Configure the hold time, which must be at least twice
the keepalive time.[edit protocols oam gre-tunnel interface interface-name]user@host# set hold-time (OAM) seconds
When the keepalive hold time expires, the GRE tunnel will stay up even though the interface cannot send or receive traffic. To verify the GRE tunnel state, check the output for the following commands:
user@host> show interfaces gr-3/3/0.3 terseInterface Admin Link Proto Local Remote
gr-3/3/0.3 up up inet 200.1.3.1/24
mpls user@host> show interfaces gr-3/3/0.3 extensiveLogical interface gr-3/3/0.3 (Index 73) (SNMP ifIndex 594) (Generation 900)
Flags: Point-To-Point SNMP-Traps 0x4000 IP-Header 10.1.19.11:10.1.19.12:47:df:64:0000000000000000 Encapsulation: GRE-NULL
Gre keepalives configured: On, Gre keepalives adjacency state: down
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Traffic statistics:
Input bytes : 15629992
Output bytes : 15912273
Input packets: 243813
Output packets: 179476
Local statistics:
Input bytes : 15322586
Output bytes : 15621359
Input packets: 238890
Output packets: 174767
Transit statistics:
Input bytes : 307406 0 bps
Output bytes : 290914 0 bps
Input packets: 4923 0 pps
Output packets: 4709 0 pps
Protocol inet, MTU: 1476, Generation: 1564, Route table: 0
Flags: Sendbcast-pkt-to-re
Addresses, Flags: Dest-route-down Is-Preferred Is-Primary
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Destination: 200.1.3/24, Local: 200.1.3.1, Broadcast: 200.1.3.255, Generation: 1366
Protocol mpls, MTU: 1464, Maximum labels: 3, Generation: 1565, Route table: 0 | Note: When the keepalive hold time has expired, the Link status will be Up and the Gre keepalives adjacency state will be Down. |
