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To enable IS-IS over switched WAN media,
do the following:
- Start the IS-IS process and assign
NETs as usual
- On each NBMA interface issue the
following:
- Design a mesh between the NBMA
peers, whether full or partial.
- Configure point-to-point
subinterfaces for each NBMA VC and assign IP addresses.
- Define the mapping of network
protocols and addresses to the VC. If manual mappings are used, for
example, x25 map,
frame-relay map, then the CLNS mapping must specify broadcast.
This is to support routing updates.
However, the IP mapping does not require this. It is used only
for next-hop resolution.
- Start IS-IS processing on the
subinterface with the ip router
isis command. This command must
not be used on the main interface or that multipoint interface
will generate a pseudonode LSP for itself.
- Use integrated IS-IS timer and
blocking command to control flooding of link-state information. Use
Integrated IS-IS timer and blocking commands.
To illustrate IS-IS configuration in a WAN environment, this IS-IS
module ends with a Frame Relay point-to-point scenario and a Frame
Relay point-to-multipoint scenario.
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