Users Guide

● ip-address [mask]— Enter the IP address and mask.
● filter-list as-path-name — Enter the name of an AS-PATH ACL.
● regexp regular-expression — Enter a regular express to match on.
When you change the best path selection method, path selections for the existing paths remain unchanged until you reset it by
using the clear ip bgp command in EXEC mode.
Configure values to reuse or restart route
OS10(config)# router bgp 102
OS10(conf-router-bgp-102)# address-family ipv4 unicast
OS10(conf-router-bgpv4-af)# dampening 2 2000 3000 10
View dampened (nonactive) routes
OS10# show ip bgp flap-statistics
BGP local router ID is 13.176.123.28
Status codes: s suppressed, S stale, d dampened, h history, * valid, > best
Origin codes: i - IGP, e - EGP, ? - incomplete
Network
From Reuse Path
Total number of prefixes: 0
View dampened paths
OS10# show ip bgp dampened-paths
BGP local router ID is 80.1.1.1
Status codes: s suppressed, S stale, d dampened, h history, * valid, > best
Origin codes: i - IGP, e - EGP, ? - incomplete
Network From Reuse Path
d* 3.1.2.0/24 80.1.1.2 00:00:12 800 9 8 i
d* 3.1.3.0/24 80.1.1.2 00:00:12 800 9 8 i
d* 3.1.4.0/24 80.1.1.2 00:00:12 800 9 8 i
d* 3.1.5.0/24 80.1.1.2 00:00:12 800 9 8 i
d* 3.1.6.0/24 80.1.1.2 00:00:12 800 9 8 i
Total number of prefixes: 5
Timers
To adjust the routing timers for all neighbors, configure the timer values using the timers command. If both the peers
negotiate with different keepalive and hold time values, the final hold time value is the lowest values received. The new
keepalive value is one-third of the accepted hold time value.
● Configure timer values for all neighbors in ROUTER-NEIGHBOR mode.
timers keepalive holdtime
○ keepalive — Time interval in seconds, between keepalive messages sent to the neighbor routers (1 to 65535, default
60).
○ holdtime — Time interval in seconds, between the last keepalive message and declaring the router dead (3 to 65535,
default 180).
Changing timers example
OS10(config)# router bgp 102
OS10(config-router-bgp-102)# neighbor 10.5.2.3
OS10(config-router-neighbor)# timers 120 200
View nondefault values
OS10# show running-configuration
...
neighbor 32.1.1.2
remote-as 103
Layer 3
645