Enterasys Networks X-Pedition XSR CLI - Manual (Page 313)

BGP Set Commands
XSR CLI Reference Guide 6-117
• The XSR penalizes a route marked as unstable with a value of 1024 each time it fails. If
penalties accrue beyond the suppress threshold you set, the route is no longer advertised.
• The XSR permits suppressed routes to rejoin the BGP routing table when their penalties drop
below the threshold.
• After a route assumes a penalty, the XSR cuts the penalty in half each time a half‐life interval
you configure elapses.
• When penalties drop below the configurable reuse value, the XSR frees the route, re‐inserting
it into the BGP routing table.
• The XSR does not suppress routes indefinitely. You can set the max‐suppress value and fix the
maximum period a route can be suppressed before it is advertised again.
Syntax
set dampening half-life | reuse | suppress | suppress-max
Syntax of the “no” Form
The no form of this command removes route dampening:
no set dampening
Mode
Route‐map configuration: XSR(config-route-map)#
Defaults
• Half‐life: 15 minutes
• Reuse: 750 seconds
• Suppress: 2000
• Suppress‐max: 60 minutes ‐ four times the half‐life value.
Example
This example displays the use of the set dampening for IP prefix 10.0.0.0 for BGP process 100:
XSR(config)#ip access-list 10 permit 10.0.0.0 255.0.0.0
XSR(config)#route-map 1 permit 1
XSR(config-route-map)#match ip address 10
XSR(config-route-map)#set 30 1500 10000 120
half-life Interval after which the route’s penalty becomes half its value, ranging from 1
to 45 minutes.
reuse Specifies how low a route’s penalty must become before the route becomes
eligible for use again after being suppressed, ranging from 1 to 20,000 seconds.
suppress Specifies how high a route’s penalty must become before the route is
suppressed, ranging from 1 to 20,000.
suppress-max Specifies that maximum interval in minutes that a route can be suppressed
regardless of how unstable it is, ranging from 1 to 20,000 minutes.