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prefix-65-127-disable

date_range 19-Nov-23

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Syntax

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prefix-65-127-disable;

Hierarchy Level

[edit chassis (QFX Series) forwarding-options lpm-profile]

Description

For the Unified Forwarding Table (UFT) feature, specify not to allocate any memory for IPv6 prefixes with lengths in the range /65 through /127 for longest-prefix-match (LPM) entries. Doing so increases the memory available for LPM entries for IPv4 unicast prefixes and IPv6 prefixes with lengths equal to or less than 64. The maximum default value for LPM entries is 16,000 IPv6 prefixes of all lengths.

In an environment where the switch is being used in the core of the network, for example, it might not need to store IPv6 prefixes with lengths in the range /65 through /127. IPv6 prefixes of this type are not typically used in the core.

Note:

When using this statement, IPv6 prefixes within the range /65 through /127 will still appear in the routing table, but will not be installed in the forwarding table; therefore, matching traffic will be dropped. Note further that if a default route is configured, traffic will be forwarded, though it will be sent through the RE and rate-limited.

Note:

On QFX5100 switches, when you configure this statement, the maximum number of LPM IPv6 entries with prefix lengths equal to or less than 64 increases to 128,000. On the QFX5200 switch, when you configure this statement, the maximum number of IPv6 entries with prefix lengths equal to or less 64 that are allocated in the LPM table increases to 98,0000.

Note:

This statement is supported only with the lpm-profile. No other profile is supported.

The effects of this statement can be seen on a QFX5100 as follows:

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[edit] 
user@host# set chassis forwarding-options lpm-profile prefix-65-127-disable


[edit] 
user@host# commit
configuration check succeeds
commit complete


[edit] 
user@host# run show chassis forwarding-options
fpc0:
--------------------------------------------------------------------------
Current UFT Configuration:                                   
lpm-profile. (MAC: 32K L3-host: 16K LPM: 128K)
prefix-65-127 = disable


[edit] 
user@host# run show pfe route summary hw
Slot 0
================ fpc0 ================

Unit: 0
Profile active: lpm-profile
Type            Max       Used      Free      % free
----------------------------------------------------
IPv4 Host       16384     20        16354     99.82
IPv4 LPM        131072    5         131065    99.99
IPv4 Mcast      8192      0         8177      99.82

IPv6 Host       8192      5         8177      99.82
IPv6 LPM(< 64)  131072    2         131065    99.99
IPv6 LPM(> 64)  0         0         0         0.00
IPv6 Mcast      4096      0         4089      99.83

Options

None	This statement has no options.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 13.2X51-D15.

Support introduced in Junos OS Release 15.1X53-D30 for QFX5200 Series switches.

Support introduced in Junos OS Release 18.1R1 for QFX5200-48C and QFX5210 switches.

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