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Exchange of IPv6 Routing Information over TCP IPv4

Figure 8 illustrates the exchange of IPv6 routing information over a TCP IPv4 connection.

Figure 8: IPv6 Routing over TCP IPv4

Image g013227.gif

The E-series router’s MP-BGP implementation uses BGP update messages to announce the feasible routes to an associated IPv6 BGP next hop and also to announce the nonfeasible routes that need to be withdrawn from the peer. The E-series router announces only IPv6 global addresses as the BGP next-hop address; it does not use the optional link-local IPv6 address as the BGP next hop.

BGP determines the next-hop addresses to be announced by using the IPv4-compatible IPv6 address. For example, the following table shows the translation of an IPv4 address.

IPv4 address	IPv6 address
10.1.1.1	::10.1.1.1

When a BGP speaker receives a BGP update message carrying IPv6 feasible routes, the speaker resolves the announced IPv6 BGP next hop by performing a route lookup to the IPv6 address in the IPv6 route table.

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