ECS4660-28F_Management Guide-R03

C HAPTER 51 | IP Routing Commands
Border Gateway Protocol (BGPv4)
– 1852 –
◆ To generate new inbound updates from stored information without
resetting peer sessions, you must preconfigure the local router using
the neighbor capability orf prefix-list command, which causes the
router to store all received updates. Note that storing updates is
memory intensive and should only be applied to critical links.
Outbound soft configuration requires no memory or preconfiguration.
Outbound re-configuration can be used on the other side of a peering
session to make initiate a new inbound policy on the local side.
◆ Use this command to clear peering sessions when changes are made to
any BGP access lists, weights, or route-maps.
◆ Route refresh (RFC 2918) allows a router to reset inbound routing
tables dynamically by exchanging route refresh requests with peers.
Route refresh relies on the dynamic exchange of information with
supporting peers. It is advertised through BGP capability negotiation,
and all BGP routers must support this capability.
EXAMPLE
This example assumes that soft re-configuration has been set on the
neighboring router.
Console(config-router)#clear ip bgp 192.168.0.254 soft in
Console(config-router)#
clear ip bgp
dampening
This command clears route dampening information and unsuppresses any
currently suppressed routes.
SYNTAX
clear ip bgp dampening [ip-address [netmask]]
ip-address – IP address of network or peer router.
netmask – Network mask that identifies the network address bits.
COMMAND MODE
Privileged Exec
DEFAULT SETTING
None
EXAMPLE
If no keywords are entered as in this example, route dampening
information is cleared for the entire routing table.
Console(config-router)#clear ip bgp dampening
Console(config-router)#