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Whether the realization of BGP4+ are completely identical with that of BGP at th

Latest reply: Mar 25, 2016 03:04:43 1278 1 0 0 0
Whether the realization of BGP4+ are completely identical with that of BGP at the present time
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Created Mar 25, 2016 03:04:43

At the present time , compare with V3, the reliability of the V5 has improve much, meanwhile it provides the support for BGP4+; About the significant properties it can only support community & reflect 、unicast but not support some import properties such as the route aggregate 、VPNV4.
The realization of BGP4+ is based on the IPV6 address family. In fact it also can be understood as the Multi-protocol Extensions for BGP-4(RFC2238)for the application of IPV6.However because the distance of the next hop has changed, the single IP address cannot meet the real requirements. For this, the update message contains two optional non-transitive route properties to control the routing for the relevant  address family which are Multi-protocol Reachable NLRI - MP_REACH_NLRI (Type Code 14, HEX:0x0E) and Multi-protocol Unreachable NLRI - MP_UNREACH_NLRI (Type Code 15, HEX:0x0F).  MP_REACH_NLRI is used to distribute the route, and MP_UNREACH_NLRI is used to withdrawn the route.
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