Route Convergence Monitoring And Diagnostics Prefix Monitoring; Route Convergence Monitoring And Diagnostics Ospf Type 3/5/7 Link-State Advertisements; Enabling Rcmd Monitoring For Is-Is Prefixes - Cisco ASR 9000 Series Routing Configuration Manual

Implementing RCMD
Route Convergence Monitoring and Diagnostics Prefix
Monitoring
The Route Convergence Monitoring and Diagnostics (RCMD) prefix monitoring feature enables convergence
monitoring for specific individual prefixes in Open Shortest Path First (OSPF) and Intermediate
System-to-Intermediate System (IS-IS) Interior Gateway Protocols (IGP). In IGP, when the route information
is created, the prefix is verified against the configured prefix-list. If the prefix is found to be monitored, it is
marked for monitoring and information about each prefix change event is captured. The RCMD prefix
monitoring individually monitors specific prefixes on each RCMD enabled router in the network. A maximum
of 10 prefixes can be monitored. Individual prefix monitoring compliments the probes enabled at customer
network edges to monitor connectivity and availability of specific service end-points.
The RCMD prefix monitoring for IS-IS prefixes is enabled by configuring the prefix-list command under
Router IS-IS monitor-convergence configuration mode. The RCMD prefix monitoring for OSPF prefixes is
enabled by configuring the prefix-list command under Router OSPF monitor-convergence configuration
mode.
For individual prefix monitoring, the prefixes are marked before those appear for the route calculation so that
the monitoring does not affect the convergence of OSPF or ISIS routes.
Route Convergence Monitoring and Diagnostics OSPF Type
3/5/7 Link-state Advertisements Monitoring
The Route Convergence Monitoring and Diagnostics (RCMD) OSPF type 3/5/7 link-state advertisements
(LSA) monitoring feature flags and differentiates the LSAs during the monitoring of LSAs. A change in route
for type 3/5/7 LSAs has to be monitored. During the route calculation, if the route source appears to be type
3/5/7 LSAs and the route change is an add or delete action, then those prefixes have to be monitored. RCMD
monitors all deletion of available paths (a purge operation) and addition of the first path (a restoration operation)
for all type 3/5/7 LSAs. The OSPF type 3/5/7 LSAs are monitored and reported on a individual prefix basis.
However, a modify operation that involves a change in paths not affecting reachability as a whole, is not
monitored. Although all prefixes are logged for reporting, the convergence tracking is rate-limited for the first
10 prefixes that are affected in an SPF run.
The RCMD OSPF type 3/5/7 LSA monitoring is enabled by configuring the track-external-routes and
track-summary-routes under Router OSPF monitor-convergence configuration mode.

Enabling RCMD Monitoring for IS-IS Prefixes

Perform this task to enable individual prefix monitoring for IS-IS prefixes.
Before You Begin
To enable monitoring of individual prefixes, first configure a prefix-list using the {ipv4 | ipv6} prefix-list
command. Then, use this prefix list with the prefix-list command.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x

Route Convergence Monitoring and Diagnostics Prefix Monitoring

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