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Config> feature layer-2-tunneling
Layer-2-Tunneling Config> encapsulator
PPP-L2TP Config> enable mp
NOTE: It IS necessary to configure PPP for this net! PPP
negotiation parameters must be configured the same for
all nets wishing to join the same Multilink PPP bundle.
PPP-L2TP Config>
Configuring Multi-Chassis MP
To configure MP for Multi-Chassis MP, configure the DIALs feature for multi-chassis
MP. The software prompts you for the endpoint discriminator to use.
Example:
Config> feature DIALs
DIALs Config> set multi-chassis-mp
Enter Endpoint Discriminator to use from stacked group (0 for box S/N): 2345
DIALs Config>
The following example shows multichassis MP when ports RTR-2 and RTR-3 are in
a hunt group.
Because there is a many-to-many relationship between access routers and
MP-concentrators, all access routers (RTR-A, RTR-B) should be kept on a separate
administrative domain from “MP concentrator” routers (RTR-Z). This applies if you
want to use remote authentication (that is,RADIUS), you will need two RADIUS
servers, one for access routers and one for MP concentrators. If you are using
local-list, you are already using separate administrative domains.
In this scenario, you can choose to tunnel based on PPP username or ″rhelm″
name. It is less rigorous to use rhelm-based tunneling. The idea is to configure a
tunnel-profile for RTR-Z on both RTR-A and RTR-B. No additional PPP users are
required on these routers. RTR-Z would require 2 tunnel-profiles: one for RTR-A
and one for RTR-B and a PPP username (in the form <
username
>@RTRZ) for
each anticipated user. All dial-in circuits are configured on the “access” routers. The
“MP concentrators” would have layer-2-tunneling devices and multilink-PPP devices.
At this point, we have “statically configured” multi-chassis MP. This means that a
particular PPP username will always terminate MP on a preconfigured router as
opposed to supporting an additional protocol which dynamically finds MP bundle
heads and tunnels when needed. This network implementation will also help avoid
Client
ISDN
221X -access
RTR-A
221X -access RTR-Z
MP-concentrator
221X -access
RTR-B
L2TP Tunnels
Figure 29. Multichassis MP
Using MP
Chapter 34. Using the Multilink PPP Protocol 513
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