Deployment Guide

368 | Border Gateway Protocol IPv4 (BGPv4)
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neighbor peer-group passive
c e s
Enable passive peering on a BGP peer group, that is, the peer group does not send an OPEN message,
but will respond to one.
Syntax(Starting
with 8.4.7.0)
neighbor peer-group-name peer-group passive [limit sessions]
Syntax(C-series
before 8.4.7.0,
E-Series,
S-Series)
neighbor peer-group-name peer-group passive [match-af]
To delete a passive peer-group, use the no neighbor peer-group-name peer-group passive
command.
Parameters
Defaults
Not configured.
Command Modes
ROUTER BGP
Usage
Information
After you configure a peer group as passive, you must assign it a subnet using the neighbor
soft-reconfiguration inbound command.
For passive eBGP limits, the Remote AS must be different from the AS for this neighbor.
Use the keyword match-af to restrict the peer adjacency established with a passive peer group.
Entering match-af requires that a peer’s address family matches the address family of the subnet
assigned to the peer group before the peer’s adjacency is brought up. For example, if the address family
of the peer group’s subnet is IPv6, only IPv6 neighbors in the subnet can be brought up in a peering
session.
You can only specify the match-af option when you first enter the neighbor peer group passive
command to configure passive peering for a BGP group. An error message is displayed if you later try
to add this option to an existing passive peer group by re-entering the command.
Related
Commands
Command
History
peer-group-name
Enter a text string up to 16 characters long as the name of the peer group.
limit
(Optional) Enter the keyword limit to constrain the numbers of sessions for this
peer-group. The range is from 2 to 256. The default is 256.
match-af (Optional) Enter the keyword match-af to specify that the address family of a peer
matches the address family of the subnet assigned to the specified peer group before
the peer’s adjacency is brought up.
Note: Starting in C-Series release 8.4.7.0, the parameter
match-af is no
longer supported.
neighbor soft-reconfiguration inbound Assign a subnet to a dynamically-configured BGP neighbor.
neighbor remote-as Assigns an indirectly connected AS to a neighbor or peer group.
Version 8.4.7.0
On C-series, removed the
match-af keyword and added the limit keyword.
Version 8.4.2.0 Added support for the match-af keyword
Version 7.8.1.0 Introduced support on S-Series
Version 7.7.1.0 Introduced support on C-Series