Controlling Route Distribution and Reception 473
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■ Members of a peer group must have the same outbound route policy with the
peer group.
■ IPv6 BGP advertises routes passing the specified policy to peers. Using the
protocol argument can filter only the specified protocol routes. If no protocol
specified, IPv6 BGP filters all routes to be advertised, including redistributed
routes and routes imported using the network command.
Configuring Route
Reception Policy
Follow these steps to configure route reception policy:
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■ Only routes passing the specified policy can be added into the local IPv6 BGP
routing table.
■ Members of a peer group can have different inbound route policies.
Configuring IPv6 BGP
and IGP Route
Synchronization
With this feature enabled and when a non-BGP router is responsible for
forwarding packets in an AS, IPv6 BGP speakers in the AS cannot advertise routing
information to outside ASs unless all routers in the AS know the latest routing
information.
By default, when a BGP router receives an IBGP route, it only checks the
reachability of the route’s next hop before advertisement. If the synchronization
feature is configured, only the IBGP route is advertised by IGP can the route be
advertised to EBGP peers.
Specify an IPv6 prefix list to
filer routes advertised to a
peer/peer group
peer { ipv6-group-name |
ipv6-address } ipv6-prefix
ipv6-prefix-name export
Required
Not specified by default
To do… Use the command… Remarks
To do… Use the command… Remarks
Enter system view system-view -
Enter BGP view bgp as-number -
Enter IPv6 address family view ipv6-family -
Configure inbound route
filtering
filter-policy { acl6-number |
ipv6-prefix
ipv6-prefix-name } import
Required
Not configured by default
Apply a routing policy to
routes from a peer/peer group
peer { ipv6-group-name |
ipv6-address } route-policy
route-policy-name import
Required
Not applied by default
Specify an ACL to filter routes
imported from a peer/peer
group
peer { ipv6-group-name |
ipv6-address } filter-policy
acl6-number import
Required
Not specified by default
Specify an AS path ACL to
filter routing information
imported from a peer/peer
group
peer { ipv6-group-name |
ipv6-address } as-path-acl
as-path-acl-number import
Required
Not specified by default
Specify an IPv6 prefix list to
filter routing information
imported from a peer/peer
group
peer { ipv6-group-name |
ipv6-address } ipv6-prefix
ipv6-prefix-name import
Required
Not specified by default
Specify the upper limit of
address prefixes imported
from a peer/peer group
peer { ipv6-group-name |
ipv6-address }
route-limit
limit [ percentage ]
Optional
By default, no limit on prefixes
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