Defaults Enabled.
Command
Modes
ROUTER BGP
Command
History
Version Description
9.2(1.0) Introduced on the Z9500.
8.2.1.0 Introduced on the E-Series ExaScale.
7.4.1.0 Introduced
Usage
Information
This is enabled by default, that is for all updates received from EBGP peers, BGP
ensures that the first AS of the first AS segment is always the AS of the peer. If not,
the update is dropped and a counter is incremented. Use the show ip bgp
neighbors command to view the “failed enforce-first-as check” counter.
If you disable enforce-first-as, you can view it using the show ip protocols
command.
Related
Commands
• show ip bgp neighbors – views the information exchanged by BGP neighbors.
• show ip protocols – views information on routing protocols.
bgp fast-external-fallover
Enable the fast external failover feature, which immediately resets the BGP session if a link to a directly
connected external peer fails.
Z9500
Syntax
bgp fast-external-fallover
To disable fast external fallover, use the no bgp fast-external-fallover
command.
Defaults Enabled.
Command
Modes
ROUTER BGP
Command
History
Version 9.2(1.0) Introduced on the Z9500.
Version 8.2.1.0 Introduced on the E-Series ExaScale.
Version 7.4.1.0 Introduced
Usage
Information
The bgp fast-external-fallover command appears in the show config
command output.
Border Gateway Protocol
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