Administrator Guide
Version Description
pre-6.1.1.1 Introduced on the E-Series.
max-metric router-lsa
Configure the maximum cost of 65535 on a new router so that it functions as a stub router in the network and OSPF traffic destined to
other networks is not forwarded on a path through the router.
C-Series, E-Series, Z-Series, S4810
Syntax max-metric router-lsa [on-startup {announce-time | wait-for-bgp [wait-time]}]
To remove the maximum metric assignment from an OSPF router and send LSAs with the currently configured
cost, enter no max-metric router-lsa [on-startup {announce-time | wait-for-bgp [wait-time]}].
Parameters
on-startup
announce-time
Enter the time (in seconds) following boot-up during which the maximum cost (65535)
for transmitting OSPF traffic on router interfaces is announced in LSAs and the router
functions as a stub router.
Range: 5 to 86400 seconds.
on-startup wait-
for-bgp [
wait-
time
]
Enable the router to announce the maximum metric in OSPF LSAs until the BGP routing
table converges with updated routes. Default: 600 seconds.
You can also specify the time (in seconds) that the router waits for the BGP routing table
to converge before it stops advertising the maximum cost in LSAs and advertises the
router’s currently configured OSPF cost. Range: 5 to 86400 seconds.
Defaults Not Configured.
Command Modes
ROUTER OSPF
Command History
Version Description
9.10(0.0) Introduced on the S6100-ON.
9.8(1.0) Introduced on the Z9100-ON.
9.1.(0.0) Introduced on the S4810 and Z9000.
8.4.2.5 Introduced on C-Series and E-Series TeraScale.
8.4.1.3 Introduced on E-Series ExaScale.
Usage Information
When you bring a new router onto an OSPF network, you can configure the router to function as a stub router by
globally reconfiguring the OSPF link cost so that other routers do not use a path that forwards traffic destined to
other networks through the new router for a specified time until the router’s switching and routing functions are
up and running, and the routing tables in network routers have converged.
By using the max-metric router-lsa command, you force the link cost of all OSPF non-stub links to the
maximum link cost (65535). The advertisement of this maximum metric causes other routers to assign a cost to
the new router that is higher than the cost of using an alternate path. Because of the high cost assigned to paths
that pass through the new router, other routers will not use a path through the router as a transit path to forward
traffic to other networks.
Use the max-metric router-lsa command to gracefully shut down or reload a router without dropping packets
destined for other networks.
NOTE: If you enter the max-metric router-lsa command without an option (on-startup
announce-
time
or on-startup wait-for-bgp [
wait-time
]), the maximum metric of 65535 is always announced
in LSAs sent by the router.
1108 Open Shortest Path First (OSPFv2 and OSPFv3)