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Configuring CoS for L2TP Tunnels on Ethernet Interfaces
The Layer 2 Tunneling Protocol (L2TP) is often used to carry traffic securely between an L2TP Network Server (LNS) to an L2TP Access Concentrator (LAC). CoS is supported for L2TP session traffic to a LAC on platforms configured as an LNS that include egress IQ2 and IQ2E Ethernet PICs. The following routers support this feature:
- M7i and M10i routers
- M120 routers
To configure CoS for L2TP on Ethernet interfaces:
- Configure L2TP services on the Ethernet interface.
- On the Ethernet interface, enable session-aware CoS for
L2TP sessions.[[edit interfaces interface-name unit logical-unit-number]user@host# set per-session-scheduler
- Configure the traffic manager in the IQ2 or IQ2E PIC to
enable per-session CoS support.[edit chassis fpc slot-number pic pic-number]user@host# set traffic-manager mode-session-shaping
- (Optional) To fine tune the system, you may also set the
traffic-manager mode to session-shaping and configure the value of
ingress-shaping-overhead parameter from 50 through 130 depending on
your network requirement.[edit chassis fpc slot-number pic pic-number]user@host# set traffic-manager ingress-shaping-overhead value mode-session-shaping
 | Note: If you deactivate or delete the primary Ethernet interface on which the L2TP tunnel is configured, the tunnel with sessions having CoS is torn down. |
After CoS is enabled for L2TP tunnels on Ethernet interface, you can run the show class-of-service l2tp-session command to verify the mapping of CoS with the configured L2TP session.
