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Capability Negotiation

The router accepts connections from peers that perform capability negotiation. Capabilities are negotiated by means of the open messages that are exchanged when the session is established. The router supports the following capabilities:

Cisco-proprietary route refresh—Capability code 128
Cooperative route filtering—Capability code 3
Deprecated dynamic capability negotiation—Capability code 66
Dynamic capability negotiation—Capability code 67
Four-octet AS numbers—Capability code 65
Graceful restart—Capability code 64
Multiprotocol extensions—Capability code 1
- address family IPv4 unicast—AFI 1 SAFI 1
- address family IPv4 multicast—AFI 1 SAFI 2
- address family IPv4 unicast and multicast—AFI 1 SAFI 3
- address family VPN-IPv4 unicast—AFI 1 SAFI 128
Route refresh—Capability code 2

The router advertises these capabilities—except for the cooperative route filtering capability—by default. You can prevent the advertisement of specific capabilities with the no neighbor capability command. You can also use this command to prevent all capability negotiation with the specified peer.

Note: The graceful restart capability is controlled with the bgp graceful-restart and neighbor graceful-restart commands rather than the neighbor capability command. However, the no neighbor capability command will prevent negotiation of the graceful restart capability.

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