Ipv6 Bgp Support; Exchange Of Ipv6 Routing Information Over Tcp Ipv4; Figure 6: Transit Service; Figure 7: Nontransit Service - Juniper BGP - CONFIGURATION GUIDE V 11.1.X Configuration Manual

JUNOSe 11.1.x BGP and MPLS Configuration Guide

Figure 6: Transit Service

Each ISP provides nontransit service to other ISPs. For example, Figure 7 on page 12
shows that ISP 1 does not permit traffic between ISP 2 and ISP 3 to cross its backbone.
If ISP 1 permits such traffic, it squanders its own resources with no benefit to its
customers or itself.

Figure 7: Nontransit Service

IPv6 BGP Support

Most of the extensions and features available in BGP for IPv4 are also available for
the IPv6 address family, such as policy-based routing, redistributing routes to and
from other protocols, route aggregation, route flap dampening, and confederations.
For a description of IPv6, see Configuring IPv6 in JUNOSe IP, IPv6, and IGP Configuration
Guide.
Multiprotocol Extensions for BGP-4 (MP-BGP) allow the exchange of IPv6 routing
information over TCP IPv4 (Figure 8 on page 13) or TCP IPv6 transport (Figure 9 on
page 13).

Exchange of IPv6 Routing Information over TCP IPv4

Figure 8 on page 13 illustrates the exchange of IPv6 routing information over a TCP
IPv4 connection.
12
Overview