BGP advertisement allows a BGP router to indicate to a peer, using the Optional Parameter, the features that it supports so that the router and peer can coordinate and use only the features that both support. Each capability in the Optional Parameter is TLV-encoded with a unique type code. The 7210 SAS supports the following capability codes:
Multiprotocol BGP (code 1)
Route refresh (code 2)
Outbound route filtering (code 3)
Graceful restart (code 64)
4-octet ASN (code 65)
Add-path (code 69)