Conguring BGP4+
• BGP4+ overview.............................................................................................................................................................................................477
• BGP global mode ......................................................................................................................................................................................... 477
• IPv6 unicast address family....................................................................................................................................................................... 478
• BGP4+ neighbors.......................................................................................................................................................................................... 479
• BGP4+ peer groups......................................................................................................................................................................................479
• BGP4+ next hop recursion.........................................................................................................................................................................480
• BGP4+ NLRIs and next hop attributes..................................................................................................................................................480
• BGP4+ route reection................................................................................................................................................................................ 481
• BGP4+ route aggregation...........................................................................................................................................................................481
• BGP4+ multipath............................................................................................................................................................................................481
• Route maps.......................................................................................................................................................................................................482
• BGP4+ outbound route ltering...............................................................................................................................................................482
• BGP4+ confederations.................................................................................................................................................................................482
• BGP4+ extended community................................................................................................................................................................... 483
• BGP4+ graceful restart................................................................................................................................................................................ 483
• Conguring BGP4+.......................................................................................................................................................................................483
BGP4+ overview
The implementation of IPv6 supports multiprotocol BGP (MBGP) extensions that allow Border Gateway Protocol version 4 plus
(BGP4+) to distribute routing information. BGP4+ supports all of the same features and functionality as IPv4 BGP (BGP4).
IPv6 MBGP enhancements include:
• An IPv6 unicast address family and network layer reachability information (NLRI)
• Next hop attributes that use IPv6 addresses
NOTE
The implementation of BGP4+ supports the advertising of routes among dierent address families. However, it supports
BGP4+ unicast routes only; it does not currently support BGP4+ multicast routes.
BGP global mode
Congurations that are not specic to address family conguration are available in the BGP global conguration mode.
device(config-bgp-router)# ?
Possible completions:
address-family Enter Address Family command mode
address-filter Configure IP address filters
aggregate-address Configure BGP aggregate entries
always-compare-med Allow comparing MED from different neighbors
always-propagate Allow readvertisement of best BGP routes not in
IP forwarding table
as-path-filter Configure autonomous system path filters
as-path-ignore Ignore AS_PATH length info for best route
selection
bgp-redistribute-internal Allow redistribution of iBGP routes into IGPs
capability Set capability
clear Clear table/statistics/keys
FastIron Ethernet Switch Layer 3 Routing
53-1003627-04 477
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