Configuring Inter-As 6Pe Optionc - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
By default, each 6PE route is assigned a label. The number of required labels is proportionate
to the number of 6PE routes to be sent to the 6PE peer. If a large number of 6PE routes are to
be sent, a large number of labels are required.
After 6PE routes to be sent to the same 6PE peer are configured to share the same explicit null
label, all the 6PE routes to be sent to 6PE peers share the same explicit null label 2. The number
of required labels is irrelevant to the number of 6PE routes to be sent. This configuration saves
label resources on 6PE devices.
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9.14.4 Configuring Inter-AS 6PE OptionC

Inter-AS IPv6 Provider Edge (6PE) OptionC enables separate IPv6 networks that connect to
different ASs to communicate over an inter-AS OptionC network.
Context
Before configuring inter-AS 6PE OptionC, configure an inter-AS OptionC network to ensure
that end-to-end MPLS label switched paths (LSPs) can be established between PEs.
Two inter-AS 6PE OptionC solutions are available, depending on the establishment methods of
end-to-end LSPs.
l
l
In an inter-AS 6PE OptionC scenario, PEs establish multi-hop MP-EBGP peer relationships to
exchange labeled IPv6 routes and establish end-to-end BGP LSPs to transmit IPv6 packets. The
way in which an end-to-end BGP LSP is established does not matter much to inter-AS 6PE
OptionC. After configuring an inter-AS OptionC network, perform the following steps on the
ingress and egress PEs that connect to separate IPv6 networks:
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
Issue 02 (2014-09-30)
NOTE
If a 6PE peer relationship has been established, running this command will trigger PEs to re-allocate labels
and cause temporary packet loss.
Solution 1: A local Autonomous System Boundary Router (ASBR) learns the labeled public
network BGP route from the peer ASBR, assigns a label to this route, and advertises this
route to its IBGP peer, a PE in the same AS. Then, a complete LSP is established between
the ingress and egress PEs on the public network. For more information, see "Configuring
Inter-AS VPN OptionC (Solution 1)" in NE80E/40E Configuration Guide - VPN.
Solution 2: The IBGP peer relationship between the PE and ASBR in the same AS is not
needed. In this solution, a local ASBR learns the labeled public network BGP route from
the peer ASBR and imports this route to an IGP to trigger LDP LSP establishment. Then,
a complete LSP is established between the ingress and egress PEs on the public network.
For more information, see "Configuring Inter-AS VPN OptionC (Solution 2)" in NE80E/
40E Configuration Guide - VPN.
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