Specifications

212 ExtremeWare XOS 10.1 Concepts Guide
Exterior Gateway Routing Protocols
Use the following command to enable route flap dampening for a BGP peer group:
configure bgp peer-group <peer-group-name> {address-family [ipv4-unicast |
ipv4-multicast]} dampening {{half-life <half-life-minutes> {reuse-limit
<reuse-limit-number> supress-limit <suppress-limit-number> max-suppress
<max-suppress-minutes>}} | policy-filter [<policy-name> | none]}
Disabling Route Flap Dampening
Use the following command to disable route flap dampening for a BGP neighbor (disabling the
dampening will also delete all the configured dampening parameters):
configure bgp neighbor [<ipaddress> | all] no-dampening
Use the following command to disable route flap dampening for a BGP peer group:
configure bgp peer-group <peer-group-name> no-dampening
Viewing the Route Flap Dampening Configuration
Use the following command to view the configured values of the route flap dampening parameters for
a BGP neighbor:
show bgp neighbor <remoteaddr> {address-family [ipv4-unicast | ipv4-multicast]}
[accepted-routes | flap-statistics | received-routes | rejected-routes |
suppressed-routes | transmitted-routes] {detail} [all | as-path <path-expression> |
community [no-advertise | no-export | no-export-subconfed | number <community_num> |
<AS_Num>:<Num> ] | network <ip_addr>/<mask_len> ]
Use the following command to view the configured values of the route flap dampening parameters for
a BGP peer group:
show bgp peer-group {detail | <peer-group-name> {detail}}
BGP Route Selection
BGP will select routes based on the following precedence (from highest to lowest):
• higher weight
• higher local preference
• shortest length (shortest AS path)
• lowest origin code
• lowest MED
• route from external peer
• lowest cost to Next Hop
• lowest routerID