38-72
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
OL-12247-04
Chapter 38 Configuring IP Unicast Routing
Configuring ISO CLNS Routing
•
You can configure the LSP refresh interval and the maximum time that an LSP can remain in the
router database without a refresh
•
You can set the throttling timers for LSP generation, shortest path first computation, and partial
route computation.
•
You can configure the switch to generate a log message when an IS-IS adjacency changes state (up
or down).
•
If a link in the network has a maximum transmission unit (MTU) size of less than 1500 bytes, you
can lower the LSP MTU so that routing will still occur.
•
The partition avoidance router configuration command prevents an area from becoming partitioned
when full connectivity is lost among a Level1-2 border router, adjacent Level 1 routers, and end
hosts.
Beginning in privileged EXEC mode, follow these steps to configure IS-IS parameters:
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
clns routing
Enable ISO connectionless routing on the switch.
Step 3
router isis
Specify the IS-IS routing protocol and enter router configuration mode.
Step 4
default-information originate
[
route-map
map-name
]
(Optional) Force a default route into the IS-IS routing domain.If you enter
route-map
map-name,
the routing process generates the default route if the
route map is satisfied.
Step 5
ignore-lsp-errors
(Optional) Configure the router to ignore LSPs with internal checksum
errors, instead of purging the LSPs. This command is enabled by default
(corrupted LSPs are dropped). To purge the corrupted LSPs, enter the
no
ignore-lsp-errors
router configuration command.
Step 6
area-password
password
(Optional Configure the area authentication password, which is inserted in
Level 1 (station router level) LSPs.
Step 7
domain-password
password
(Optional) Configure the routing domain authentication password, which is
inserted in Level 2 (area router level) LSPs.
Step 8
summary-address
address mask
[
level-1
|
level-1-2
|
level-2
]
(Optional) Create a summary of addresses for a given level.
Step 9
set-overload-bit
[
on-startup
{
seconds
|
wait-for-bgp
}]
(Optional) Set an overload bit (a hippity bit) to allow other routers to ignore
the router in their shortest path first (SPF) calculations if the router is
having problems.
•
(Optional)
on-startup
—sets the overload bit only on startup. If
on-startup
is not specified, the overload bit is set immediately and
remains set until you enter the
no set-overload-bit
command. If
on-startup
is specified, you must enter a number of seconds or
wait-for-bgp
.
•
seconds
—When the
on-startup
keyword is configured, causes the
overload bit to be set upon system startup and remain set for this
number of seconds. The range is from 5 to 86400 seconds.
•
wait-for-bgp
—When the
on-startup
keyword is configured, causes
the overload bit to be set upon system startup and remain set until BGP
has converged. If BGP does not signal IS-IS that it is converged, IS-IS
will turn off the overload bit after 10 minutes.
