Configuring Basic 6Pe Capabilities; Configuration Prerequisites - 3Com MSR 50 Series Configuration Manual

1030 C 62: IP 6 BGP C
HAPTER V
n
Configuration
Prerequisites
Configuring Basic 6PE
Capabilities
ONFIGURATION
capability for sparsely populated IPv6 networks, allowing customer edge (CE)
routers in these isolated IPv6 networks to communicate with IPv4 PE routers.
Work mechanism of 6PE:
IPv6 routing information from users is converted into IPv6 routing information
with labels and then is flooded into IPv4 backbone networks of ISPs through
internal border gateway protocol (IBGP) sessions. When IPv6 packets are
forwarded, they will be labeled when entering tunnels of backbone networks. The
tunnels can be GRE tunnels or MPLS LSPs.
IGPs running on ISP networks can be OSPF or IS-IS. Static routing, IGP, or EBGP can
be used between CE and 6PE.
Figure 303 Network diagram for 6PE
CE
IPv6 network
Customer site
The P (Provider) router in the above figure refers to a backbone router in the
network of a service provider. P is not directly connected with a CE and is required
to have the basic MPLS capability.
When an ISP wants to utilize the existing IPv4/MPLS network to provide IPv6 traffic
switching capability through MPLS, only the PE routers need to be upgraded.
Therefore, it is undoubtedly a high efficient solution that ISPs use the 6PE
technology as an IPv6 transition mechanism. Furthermore, the operation risk of
the 6PE technology is very low.
Before configuring 6PE, you need to:
Configure the MPLS basic capability for the IPv4 MPLS backbone. For details,
■
refer to "MPLS Basics Configuration" on page
Configure the IPv6 BGP peer on the PE devices. For details, refer to
■
"Configuring IPv6 BGP Basic Functions" on page
If a peer group is to be specified, you need to create the peer group
■
beforehand in BGP view.
Follow these steps to configure the 6PE basic capabilities:
To do...
Enter system view
Enable BGP and enter BGP
view
IPv4/MPLS network
IBGP
6PE
P
Use the command...
system-view
bgp as-number
CE
6PE IPv6 network
Customer site
1311.
1017.
Remarks
-
Required
Not enabled by default