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max-unique-prefixes
Enables/disables limit checking and configures the maximum number of unique routes allowed in the BGP routing table.
Syntax: max-unique-prefixes [value | no-limit]
value
Sets the maximum number of unique routes allowed in the routing table to the specified number. Valid values are 0 - 450,000.
no-limit
Disables limit checking for number of unique routes.
Description: Large numbers of BGP unique routes can strain the resources of the Avici router server. The max-unique-prefixes command enables limit checking on the number of unique routes in the BGP routing table. If the limit is reached, additional routes are gracefully discarded without resetting the BGP sessions.
Use the max-unique-prefixes value command to enable limit checking and set the maximum number of unique routes to the specified number.
NOTE The number of prefixes currently in the routing table must be LESS than the specified number.
Use the max-unique-prefixes no-limit command to disable limit checking.
NOTE When limit checking is disabled, the Avici router will accept routes until the processing limits of the server are reached. Additional routes may the Avici router to reset.
Factory Default: Limit checking is enabled with a default value of 450,000 unique routes.
Command Mode: Router configuration.
Example 1: In the following example:
- The router bgp command enables BGP routing and associates the router with autonomous system 101.
- The max-unique-prefixes value command enables limit checking on the number of unique routes in the BGP routing table, and sets the maximum number allowed at 290,000.
- The show ip bgp route-dropped-sessions command displays the new setting:
router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
router(config)#router bgp 101
router(config-router)#max-unique-prefixes 290000
router(config-router)#end
router#show ip bgp route-dropped-sessions
Bgp Soft Landing Global Statistics
Reason for dropping first Route : No Routes Dropped
Time Since First Dropped : 0:00:00
Maximum Bgp Prefix Check : Enabled
Current Number of Bgp Prefixes : 102970
Configured Maximum Bgp Prefixes : 290000
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Example 2: The following sample output of show ip bgp route-dropped-sessions displays routes that have been dropped due to exceeding the threshold configured using the max-unique-prefixes command:
Bgp Soft Landing Global Statistics
Reason for dropping first Route :Max. Bgp Unique Route Exceeded
Time Since First Dropped :0:00:33
Maximum Bgp Prefix Check :Enabled
Current Number of Bgp Prefixes :10000
Configured Maximum Bgp Prefixes :10000
Minimum System Memory Check :Enabled
Current Free System Memory :85
Configured Minimum System Memory :10
Maximum Bgp Route Instances Check :Enabled
Current Number of Bgp Routes Instances :10000
Configured Maximum Bgp Route Instances :10000
Bgp Soft Landing Peer Statistics
Neighbor AS PfxRcd PfxDropped Time Reason
190.1.1.2 200 10000 5001 0:00:33 Max. Bgp Unique Route Exceeded
Example 3: In the following example:
- The router bgp command enables BGP routing and associates the router with autonomous system 101.
- The max-unique-prefixes no-limit command disables limit checking on the number of unique routes in the BGP routing table.
- The show ip bgp route-dropped-sessions command displays the new setting:
router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
router(config)#router bgp 101
router(config-router)#bgp default max-route-instance no-limit
router(config-router)#end
router#show ip bgp route-dropped-sessions
Bgp Soft Landing Global Statistics
Reason for dropping first Route : No Routes Dropped
Time Since First Dropped : 0:00:00
Maximum Bgp Prefix Check : Disabled
Current Number of Bgp Prefixes : 102970
Configured Maximum Bgp Prefixes : 0
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Related Commands: clear ip bgp route-dropped-sessions
max-route-instances
min-memory-threshold
router bgp
show ip bgp
show ip bgp routes-dropped-sessions
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Copyright © 2004
Avici Systems Inc.
Avici® and TSR®
is a registered trademark of Avici Systems Inc.
IPriori™, Composite Links™, SSR™, QSR, and NSR® are
trademarks of Avici Systems Inc.
Source
File Name: BGP_Nd.fm
HTML File Name: BGP_Nd22.html
Last Updated: 05/10/04 at 16:36:55