Dell S3048-ON, Configuration Manual

Page: 212 / 1036

BGP table version is 855562, main routing table version 780266
122836 network entrie(s) and 221664 paths using 29697640 bytes of memory
34298 BGP path attribute entrie(s) using 1920688 bytes of memory
29577 BGP AS-PATH entrie(s) using 1384403 bytes of memory
184 BGP community entrie(s) using 7616 bytes of memory
Dampening enabled. 0 history paths, 0 dampened paths, 0 penalized paths
Neighbor AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.114.8.34 18508 82883 79977 780266 0 2 00:38:51 118904
10.114.8.33 18508 117265 25069 780266 0 20 00:38:50 102759
Dell>
To view which routes are dampened (non-active), use the
show ip bgp dampened-routes
command in EXEC Privilege mode.
Changing BGP Timers
To configure BGP timers, use either or both of the following commands.
Timer values configured with the
neighbor timers
command override the timer values configured with the
timers bgp
command.
When two neighbors, configured with different
keepalive
and
holdtime
values, negotiate for new values, the resulting values are as
follows:
• the lower of the holdtime values is the new holdtime value, and
• whichever is the lower value; one-third of the new
holdtime
value, or the configured
keepalive
value is the new
keepalive
value.
• Configure timer values for a BGP neighbor or peer group.
CONFIG-ROUTER-BGP mode
neighbors { ip-address | peer-group-name } timers keepalive holdtime
•
keepalive
: the range is from 1 to 65535. Time interval, in seconds, between keepalive messages sent to the neighbor routers.
The default is 60 seconds .
•
holdtime
: the range is from 3 to 65536. Time interval, in seconds, between the last keepalive message and declaring the router
dead. The default is 180 seconds .
• Configure timer values for all neighbors.
CONFIG-ROUTER-BGP mode
timers bgp keepalive holdtime
•
keepalive
: the range is from 1 to 65535. Time interval, in seconds, between keepalive messages sent to the neighbor routers.
The default is 60 seconds .
•
holdtime
: the range is from 3 to 65536. Time interval, in seconds, between the last keepalive message and declaring the router
dead. The default is 180 seconds .
To view non-default values, use the
show config
command in CONFIGURATION ROUTER BGP mode or the
show running-
config bgp
command in EXEC Privilege mode.
Enabling BGP Neighbor Soft-Reconfiguration
BGP soft-reconfiguration allows for faster and easier route changing.
Changing routing policies typically requires a reset of BGP sessions (the TCP connection) for the policies to take effect. Such resets cause
undue interruption to traffic due to hard reset of the BGP cache and the time it takes to re-establish the session. BGP soft reconfig allows
for policies to be applied to a session without clearing the BGP Session. Soft-reconfig can be done on a per-neighbor basis and can either
be inbound or outbound.
BGP soft-reconfiguration clears the policies without resetting the TCP connection.
212 Border Gateway Protocol IPv4 (BGPv4)