High Availability; Preferred Tunnel Path - Cisco CRS Configuration Manual

Ios xr virtual private network
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Implementing Point to Point Layer 2 services
interfaces as L2 packets and transported on the core-facing interfaces as MPLS (EoMPLS) or IP (L2TP)
packets.
Figure 8: L2VPN QoS Reference Model

High Availability

L2VPN uses control planes in both route processors and line cards, as well as forwarding plane elements in
the line cards.
Note
The l2tp_mgr process does not support high availability.
The availability of L2VPN meets these requirements:
• A control plane failure in either the route processor or the line card will not affect the circuit forwarding
• The router processor control plane supports failover without affecting the line card control and forwarding
• L2VPN integrates with existing Label Distribution Protocol (LDP) graceful restart mechanism.

Preferred Tunnel Path

Preferred tunnel path functionality lets you map pseudowires to specific traffic-engineering tunnels. Attachment
circuits are cross-connected to specific MPLS traffic engineering tunnel interfaces instead of remote PE router
IP addresses (reachable using IGP or LDP). Using preferred tunnel path, it is always assumed that the traffic
engineering tunnel that transports the L2 traffic runs between the two PE routers (that is, its head starts at the
imposition PE router and its tail terminates on the disposition PE router).
path.
planes.
Cisco IOS XR Virtual Private Network Configuration Guide for the Cisco CRS Router, Release 6.1.x
High Availability
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