Exchange of IPv6 Routing Information over TCP IPv6
Figure 9 on page 14 illustrates the exchange of IPv6 routing information over a TCP IPv6
connection.
Figure 9: IPv6 Routing over TCP IPv6
Link-Local Next Hops in MP-BGP Packets
When the router has an external directly connected (non-multihop) BGP peer, the router
advertises two next hops. It advertises the global next hop and a next hop with a link-local
address. The link-local next hop is advertised even when the router has been configured
with the next-hop self feature. Advertising the link-local next hop enables the configuration
of single-hop EBGP sessions for IPv6 next hops.
For all other types of peers, the router advertises only the global BGP IPv6 next hop.
You can overwrite the global and link-local IPv6 next-hop addresses by configuring and
applying a route map that sets the addresses. The set ipv6 next-hop clause in the route
map can specify a global address, a link-local address, or both for the next hop.
However, a neighbor outbound route map that adds a link-local IPv6 address for peers
where the router should not advertise a link-local next hop is considered an invalid
configuration.
The router accepts both global and link-local BGP IPv6 next-hop addresses received
from its BGP IPv6 peers. As a consequence, when advertising a route to an internal peer,
the router can modify the network address of the next-hop field by removing the link-local
IPv6 address of the next hop.
For static BGP peers, the JunosE Software does not support the use of link-local addresses
when you configure BGP peers. You cannot configure the local interface for a neighbor
that has been configured with a link-local address. Although you can configure a neighbor
with a link-local address, a BGP session to that peer over TCP IPv6 does not come up.
For dynamic BGP peers, an E Series router can accept incoming TCP sessions with the
link-local address as the source address. However, the BGP peering does not come up
for such a connection.
Platform Considerations
For information about modules that support BGP on the ERX7xx models, ERX14xx models,
and the Juniper Networks ERX310 Broadband Services Router:
•
See ERX Module Guide, Table 1, Module Combinations for detailed module specifications.
•
See ERX Module Guide, Appendix A, Module Protocol Support for information about the
modules that support BGP.
Copyright © 2010, Juniper Networks, Inc.14
JunosE 11.2.x BGP and MPLS Configuration Guide
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