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DES-7200 Configuration Guide Chapter 4 OSPF
Configuration
4-21
smoothly join/exit the network, we can configure such routers as a Stub Router,
which will advertise its maximum metric so that other routers will not preferentially
use this device as the transit node during SPF calculation.
After executing "max-metric router-lsa" command, the metric of non-stub links
carried on the Router LSA generated by the router will be set to the maximum
value (0xFFFF). Removing this configuration or timer timeout will restore the links
to the default metric.
By default, if this command is enabled, stub links will still advertise the ordinary
metric, namely the cost of egress interface. If "include-stub" parameter is
configured, stub links will advertise the maximum metric.
If an ABR device doesn't want to transmit the traffic of area, use "summary-lsa"
parameter to configure summary LSA to the maximum metric.
If an ASBR device doesn't want to transmit the external traffic, use "external-lsa"
parameter to configure external LSA to the maximum metric.
The command of "max-metric router-lsa" is generally used in the following
circumstances:
Reload the device. After reloading the device, the IGP protocol will generally
converge faster, and other devices will try to forward traffic through the newly
reloaded device. If the current device is still building BGP routing tables and
certain BGP routes haven't be learned, packets destined for such network
will be dropped. In such a case, use "on-startup" parameter to configure a
delay timer, so that the device can act as the transmit node after the timer
runs out.
Join the device into network without transmitting traffic. If there are alternate
paths, then the current device won't be used to transmit traffic; if there is no
alternate path, then the current device will still be used to transmit traffic.
Gracefully remove the device from the network. By using this command, the
current device will advertise a maximum metric value, so that other devices
on the network will select the alternate paths to transmit traffic before the
device is shut down.
To configure a router to advertise a maximum metric, execute the following
commands in routing process configuration mode:
Command Meaning
DES-7200 # configure terminal
Enter the global configuration mode.
DES-7200 (config)# router ospf 1
Enable the OSPF and enter the OSPF
configuration mode.
DES-7200 (config-router)# max-metric
router-lsa [external-lsa
(Optional) Configure the router to advertise
a maximum metric.