Panasonic NN46240-710 - Manual (Page 114)

4 MPLS L2VPN troubleshooting
Nortel Secure Router 8000 Series
_________ Troubleshooting - VPN
4.1.3 SVC MPLS Layer 2 VPN
SVC is another type of static MPLS Layer 2 VPN. The SVC transfers Layer 2 VPN information
without using the signaling protocol but it requires manual configuration of VC label
information.
When creating a static SVC Layer 2 VPN connection, you can use a tunnel policy to specify the
tunnel type, which can be an LDP Label Switched Path (LSP), Constraint-Based Routing using
LDP (CR-LDP) or Generic Routing Encapsulation (GRE) tunnel. Load balancing is also
supported.
The SVC supports multihop inter-AS Layer 2 VPN but does not support local connection.
CD
NOTE
CCC, SVC, and static LSP use the same label range of 16 to 1023.
4.1.4 Martini MPLS Layer 2 VPN
Martini mode is simple. It implements Layer 2 VPN by setting up a point-to-point link and
transports Layer 2 information and VC labels using LDP.
In Martini mode, you can identify a VC between two CEs by using the VC type together with
the VC ID.
• VC type: represents the encapsulation type of a VC, which can be ATM (atm-aal5-sdu),
VLAN, or Point-to-Point Protocol (PPP).
• VC ID: is used to flag a VC. For VCs of the same type, the VC ID must be unique on the
same PE.
PEs exchange VC labels using LDP and associate CEs using the VC ID. After a tunnel is set up
successfully between PEs and label exchange, and bindings are complete, a VC is established.
For the remote connection, you must establish a remote LDP session to transport VC FECs and
VC labels. This is because, the two PEs that exchange VC labels may not directly connect.
The Martini mode supports multihop inter-AS Layer 2 VPN but does not support local
connection.
Martini MPLS Layer 2 VPN supports Graceful Restart (GR) . After router switchover, the VC
label remains unchanged. During the switchover, the VC remains up.
After the switchover, the original label saved at the local end is deleted if found different from
the one learned from the LDP peer. The VC that uses this label then becomes down.
Figure 4-3 shows the Martini signaling process.
4-4 Nortel Networks Inc. Issue 5.3 (30 March2009)