Dell S4048-ON, Руководство по настройке

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To view a count of dampened routes, history routes, and penalized routes when you enable route dampening, look at the seventh line
of the
show ip bgp summary
command output, as shown in the following example (bold).
Dell>show ip bgp summary
BGP router identifier 10.114.8.131, local AS number 65515
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.
Border Gateway Protocol IPv4 (BGPv4)
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