From: Murphy, Brennan (Brennan_Murphy@xxxxxxx)
Date: Tue Nov 06 2001 - 12:47:20 GMT-3
What would be a reason for using ILMI and OAM
at the same time?
From:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/wan_c
/wcatm.htm#21797
Configure VC Management
When you configure VC management, you enable the router to detect VC
connections and disconnections automatically. This notifies protocols to
reroute packets immediately, preventing protocols from waiting for
unpredictable and relatively long timeout periods.
You may use Integrated Local Management Interface (ILMI) or Operation,
Administration, and Maintenance (OAM) or both for managing your PVCs, and
OAM for managing your SVCs. For PVCs, you must decide which method is
reliable in your particular network.
When ILMI and OAM management methods are both configured to manage a PVC,
both must indicate that a PVC is up in order for that PVC to be determined
as up. If either ILMI or OAM is not configured, a PVC will be managed by the
method that is configured.
When a PVC goes down, route caches for protocols configured on that PVC are
cleared (or flushed) so that new routes may be learned. The route cache
flush is applied on the PVC's interface. When all PVCs on a subinterface go
down, VC management shuts down the subinterface in addition to flushing
route caches. ATM hardware must keep the PVC active, however, so that OAM
and ILMI cells may flow. When any PVC on a subinterface comes up, the
subinterface is brought up.
VC management using ILMI is referred to as ILMI management. VC management
using OAM is referred to as OAM management. To configure either management
method or both, perform the tasks in one or both of the following sections:
Brennan Murphy
Network Engineer
Network Associates Inc
Office: 703-356-2225 ext 128
Cell: 703-338-2447
Pager: 7033382447@mobile.att.net
8000 Westpark Drive Suite 600
McLean, VA 22102
bmurphy@nai.com
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