Cisco Cisco IOS Software Release 12.2(27)SBC
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L2TP Redirect
The L2TP Redirect feature allows a tunnel server participating in Stack Group Bidding Protocol (SGBP)
to send a redirect message to the network access server (NAS) if another tunnel server wins the bid for
a Layer 2 Tunnel Protocol (L2TP) call.
to send a redirect message to the network access server (NAS) if another tunnel server wins the bid for
a Layer 2 Tunnel Protocol (L2TP) call.
In a traditional Multichassis Multilink PPP (MMP) deployment, the stack group tunnel servers use Layer
2 Tunnel Protocol (L2TP) or Layer 2 Forwarding (L2F) tunnels to deliver Multilink PPP (MLP) links to
the bundle owner. This architecture does not easily scale beyond a few routers per tunnel server stack,
and inherently adds hops and latency variations between links in a bundle.
2 Tunnel Protocol (L2TP) or Layer 2 Forwarding (L2F) tunnels to deliver Multilink PPP (MLP) links to
the bundle owner. This architecture does not easily scale beyond a few routers per tunnel server stack,
and inherently adds hops and latency variations between links in a bundle.
Enabling the L2TP Redirect feature increases the scalability of Multichassis Multilink PPP (MMP)
deployments, load balances sessions across the stack group tunnel servers, and smooths traffic as all
links in a multilink bundle experience the same delay and latency.
deployments, load balances sessions across the stack group tunnel servers, and smooths traffic as all
links in a multilink bundle experience the same delay and latency.
Configuration Information
Configuration information is included in the “Configuring Multihop VPDN” module in the
, Release 12.4T, at the following URL:
Command Reference
This section documents modified commands.
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