MPLS Guide Label Distribution Protocol
3HE 18686 AAAB TQZZA © 2022 Nokia.
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5.4.12.2 Interoperability with Implementations Compliant with RFC
5036 for IPv4 LDP Control Plane Only
Some third-party LDP implementations are compliant with RFC 5036 for LDP IPv4
but are not compliant with RFC 5036 for handling IPv6 address or IPv6 FECs over
an LDP IPv4 session.
An LSR based on the 7705 SAR in a LAN with a broadcast interface can peer with
any third-party LSR, including those that are incapable of handling IPv6 address or
IPv6 FECs over an LDP IPv4 session. When the 7705 SAR uses the IPv4 LDP
control plane to advertise IPv6 addresses or IPv6 FECs to that peer, it can cause the
IPv4 LDP session to go down.
To address this issue, draft-ietf-mpls-ldp-ipv6 modifies RFC 5036 and requires
compliant systems to check for the dual-stack capability TLV in the IPv4 Hello
message from the peer. If the peer does not advertise this TLV, the LSR does not
send IPv6 addresses and FECs to that peer. The 7705 SAR supports advertising and
resolving IPv6 prefix FECs over an LDP IPv4 session using a 32-bit LSR ID in
compliance with draft-ietf-mpls-ldp-ipv6.
5.4.13 Upgrading from IPv4 to IPv6
For smooth transition from IPv4 to IPv6, it is recommended to follow the steps below.
Step 1. Create a new IPv6 interface in the 7750 SR management VPRN.
Step 2. Configure a new Layer 3 Spoke SDP configured with LDPv6 and a far-end
IPv6 address, and assign it to the new IPv6 interface.
Step 3. On the 7705 SAR, in the management Epipe create an endpoint object and
assign the endpoint to the existing IPv4 PW. Ensure there is no traffic lost
during this step.
Step 4. On the 7705 SAR, create a new SDP with LDPv6 and a far-end IPv6
address.
Step 5. On the 7705 SAR, within the management Epipe, assign the new SDP to
a spoke SDP with the same endpoint as the IPv4 spoke SDP.
Step 6. On the 7750 SAR, shut down the IPv4 interface.
Step 7. On the 7705 SAR, start IPv6 traffic and ensure reachability to 7705 via the
IPv6 SDP.
Step 8. Remove the IPv4 SDP and spokes from the 7705 SAR Epipe and 7750 SR
VPRN.
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