29.1.1 Overview
The BGP4 routing protocol used at the interface backbone level has been extended to BGP4+ (Multiprotocol Extensions for Border Gateway Protocol 4) to make it available to protocols other than IPv4. BGP4+ can handle all the routing information used on the Internet.
The following table describes the functional differences between BGP4+ (IPv6) and BGP4 (IPv4).
Functionality |
BGP4+ (IPv6) |
BGP4 (IPv4) |
---|---|---|
EBGP, IBGP peering, and route distribution |
OK |
OK |
Route filtering and BGP attribute manipulation |
OK |
OK |
Community |
OK |
OK |
Route reflection |
OK |
OK |
Confederations |
OK |
OK |
Capability negotiation |
OK |
OK |
Route refresh capability |
OK |
OK |
Multipath |
OK |
OK |
Peer group*1 |
OK |
OK |
Route flap dampening*2 |
OK |
OK |
BGP4 MIB #2 |
NG |
OK |
TCP MD5 authentication |
OK |
OK |
Graceful restart |
OK |
OK |
Maximum number of learned routes |
OK |
OK |
Legend: OK: Supported, NG: Not supported
#1: A peer group is a grouping of external peers and member AS peers, or a grouping of internal peers.
#2: Not supported in VRFs