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JunosE 11.3.x IP, IPv6, and IGP Configuration Guide
Configuring Link-State Metrics
isis metric
Configuring a Reference Bandwidth to Set a Default Metric
338
Use to configure HMAC MD5 authentication for an interface, and to enable MD5
authentication of level 1 or level 2 hello packets.
Generates a secure, encrypted message digest of level 1 or level 2 hello packets and
inserts the digest into the packet from which it is created. Level 1 is the default.
You can specify whether the key is entered in unencrypted or encrypted format. If you
do not specify which, the string is assumed to be unencrypted.
Example
host1(config-if)#isis message-digest-key 3 hmac-md5 wdi6c3s39n level-2
For point-to-point interfaces, configure keys only for level 1, because only one hello
packet is sent (at level 1), not one at level 1 and one at level 2. Keys configured at level
2 are ignored for point-to-point interfaces.
Use the no version to delete the MD5 key, specified by the key ID, from the interface.
See isis message-digest-key
You can configure the routing metric (cost) for an IS-IS interface. Routes with lower total
path metrics are preferred over those with higher path metrics.
Use to configure a cost for a specified interface.
You can select a number in the range 0–63 if you configured the router with the
metric-style narrow command. You can select a number in the range 0–16277215 if
you configured the router with the metric-style transition or the metric-style wide
command.
The default value is 10. The default metric is the value assigned when no quality of
service (QoS) routing is performed.
You can configure the default metric for a specified interface by selecting level 1 or
level 2 routing. This resets the metric only for level 1 or level 2 routing, respectively. If
you do not specify a level, the command specifies both level 1 and level 2 by default.
We recommend that you configure a reference bandwidth if you want the default cost
on interfaces to be related to link speed. If you do not, the default IS-IS metrics are
simply hop-count-like metrics.
Example
host1(config-if)#isis metric 20 level-2
Use the no version to restore the default value, 10.
See isis metric
By default, all IS-IS interfaces without a configured metric have the same routing metric,
10, However, when you configure a reference bandwidth for IS-IS, the default metric is
Copyright © 2010, Juniper Networks, Inc.
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