Global as4 configuration, Peer group configuration of as4s, Neighbor configuration of as4s – Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide User Manual
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You can enable AS4s on a device, a peer group, and a neighbor. For global configuration, the
capability command in the BGP4 configuration context enables or disables AS4 support. For a peer
group or a neighbor, capability is a keyword for the neighbor command. In addition to enabling AS4s
for a neighbor or a peer group, you can also use the combination of the capability keyword and the
optional enable or disable keyword to disable this feature in a specific case where the AS4s are
enabled for a larger context. The Neighbor configuration of AS4s section illustrates this capability.
Global AS4 configuration
To enable AS4s globally, use the capability command in the BGP4 configuration context as shown.
device(config-bgp)# capability as4 enable
Syntax: [no] capability as4 enable | disable
The no form of the capability command deletes the announcement and negotiation configuration of
AS4s (if it has been enabled) at the global level. Using the regular form of the command with the
disable keyword has the same effect on the global configuration. Disabling or using the no form of the
command does not affect the configuration at the level of a peer or neighbor.
The consequences of choosing between the enable or disable keyword are reflected in the output of
the show running configuration command.
Peer group configuration of AS4s
To enable AS4s for a peer group, use the capability keyword with the neighbor command in the BGP4
configuration context, as the following example for the Peergroup_1 peer group illustrates.
device(config-bgp)# neighbor Peergroup_1 capability as4 enable
Syntax: [no] neighbor peer-group-name capability as4 enable | disable
The no form of the neighbor command along with the capability and as4 keywords disables the
announcement and negotiation of AS4s in the named peer group. Using the regular form of the
command with the disable keyword has the same effect on the neighbor configuration.
The consequences using the enable or disable keywords are reflected in the output of the show
running configuration command. However, if the peer group configuration omits an explicit AS4
argument, the show running configuration output will not contain AS4 information.
Neighbor configuration of AS4s
To enable AS4s for a neighbor, use the capability and as4 keywords with the neighbor command in
the BGP4 configuration context, as the following example for IP address 1.1.1.1 illustrates.
device(config-bgp)# neighbor 1.1.1.1 capability as4 enable
Syntax: [no] neighbor IPaddress capability as4 enable | disable
The no form of the neighbor command with the capability and as4 keywords deletes the neighbor-
enable for AS4s.
The consequences of using the enable or disable keywords are reflected in the output of the show
running configuration command. However, if the neighbor configuration omits an explicit AS4
argument, the show running configuration output will not contain AS4 information.
To disable AS4s on a particular neighbor within a peer group that is enabled for AS4s, enter a
command similar to the following.
device(config-bgp)# neighbor 1.1.1.1 capability as4 disable
Configuring BGP4 (IPv4)
FastIron Ethernet Switch Layer 3 Routing Configuration Guide
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