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Configuring BGP 465
Table 547 Configure Route Dampening
By default, route dampening is disabled.
2 Display route flap information.
Perform the following configurations in system view.
Table 548 Display Route Flap Information
Configuring
Synchronization of BGP
and IGP
BGP protocol prescribes that a BGP router does not advertise the destination
known through internal BGP peers to external peers unless the destination can be
known also through IGP. If a router can know the destination through IGP, then
the route can be distributed in the AS because an internal connection has been
ensured.
One major task of the BGP protocol is to distribute the network reachable
information of the local AS to other ASs. Therefore, BGP needs to distribute the
route information by synchronization with IGP (such as RIP and OSPF),
Synchronization means that BGP cannot distribute transition information to other
ASs until IGP broadcasts the route information successfully within its AS. That is to
say, before a router receives an updated destination information from an IBGP
Operation Command
Put BGP route attenuation in effect or
modify BGP route attenuation parameter
dampening [ half-life-reachable
half-life-unreachable reuse suppress
ceiling ] [ route-policy policy-name
]
Clear route routing dampening
information and de-suppress the
suppressed route
reset dampening [ network-address [
mask ] ]
Disable the route dampening undo dampening
Operation Command
Display BGP dampened routes display bgp routing-table dampened
Display flap information of all routes display bgp routing-table
flap-information
Display the route flap statistics of routes
with AS path comply with regular
expression
display bgp routing-table
flap-information regular-expression
as-regular-expression
Reset BGP flap information matching AS
path regular expression
reset bgp flap-information
regular-expression [
as-regular-expression ]
Display the route flap statistics of routes
that passed AS filter-list
display bgp routing-table
flap-information acl
[aspath-list-number ]
Clear BGP flap information matching the
specified filter list
reset bgp flap-information acl
[aspath-list-number ]
Display the route flap statistics of routes
with designated destination address
display bgp routing-table
flap-information network-address
mask [ longer-match ]
Clear the route flap statistics of routes
with designated destination address
reset bgp flap-information
network-address
Clear the route flap statistics of routes
received from the specified peer.
reset bgp network-address
flap-information