Concept Guide
Usage Information To prevent loops, the neighbor ebgp-multihop command does not install default routes of the multihop
peer. Networks not directly connected are not considered valid for best path selection.
neighbor fall-over
Enable or disable fast fall-over for BGP neighbors.
Syntax
neighbor {ipv6-address | peer-group-name} fall-over
To disable, use the no neighbor {ipv6-address | peer-group-name} fall-over command.
Parameters
ipv6-address Enter the IPv6 address in the x:x:x:x::x format.
NOTE: The :: notation species successive hexadecimal elds of zeros.
peer-group-name Enter the name of the peer group.
Defaults Disabled.
Command Modes ROUTER BGP
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.2(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information When you enable fall-over, BGP keeps track of IP or IPv6 reachability to the peer remote address and the peer
local address. Whenever either address becomes unreachable (for examle, no active route exists in the routing
table for peer IP or IPv6 destination/local address), BGP brings down the session with the peer.
Related Commands show ip bgp ipv6 unicast neighbors — displays IPv6 routing information exchanged by BGP neighbors.
neighbor lter-list
Congure a BGP lter based on the AS-PATH attribute.
Syntax
neighbor {ipv6-address | peer-group-name} filter-list as-path-name {in | out}
To delete a BGP lter, use the no neighbor {ipv6-address | peer-group-name} filter-list
as-path-name {in | out} command.
Parameters
ipv6-address Enter the IPv6 address in the x:x:x:x::x format.
NOTE: The :: notation species successive hexadecimal elds of zeros.
peer-group-name Enter the name of the peer group to apply the lter to all routers in the peer group.
in Enter the keyword in to lter inbound BGP routes.
out Enter the keyword out to lter outbound BGP routes.
IPv6 Border Gateway Protocol (IPv6 BGP) 705