Information Technology Reference
In-Depth Information
Table12-8 ISO CLNS: Redistribution Causes Routing Problems (continued)
Possible Problem
Solution
Redistribution
feedback loop
exists
Redistribution between an IS-IS cloud and an ISO-IGRP cloud
should be performed only at a single point. If it is not, routing
information can be advertised back into one of the clouds,
causing routing feedback loops.
Examples:
The following example illustrates redistribution of ISO-IGRP
routes of Michigan and ISO-IGRP routes of Ohio into the IS-IS
area tagged
USA
:
router isis USA
redistribute iso-igrp Michigan
redistribute iso-igrp Ohio
The following example illustrates redistribution of IS-IS routes
of France and ISO-IGRP routes of Germany into the ISO-IGRP
area tagged
Backbone
:
router iso-igrp Backbone
redistribute isis France
redistribute iso-igrp Germany
Redistribution
feedback loop
exists
(continued)
If you must redistribute at another point, use default metrics to
perform the redistribution in one direction only.
Refer to the Cisco IOS
Network Protocols Configuration Guide,
Part 2,
and
Network Protocols Command Reference, Part 2,
for
information about adjusting ISO CLNS default metrics.
ISO CLNS: Poor Performance
Symptom:
Users experience poor performance or sudden loss of connections. One or more routers
might be receiving duplicate routing updates and might see routers and ESs on multiple interfaces.
