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| Unicast Routing
C
20
HAPTER
Configuring the Open Shortest Path First Protocol (Version 2)
the OSPF header when routing protocol packets are originated by this
device.
A different password can be assigned to each network interface, but the
password must be used consistently on all neighboring routers
throughout a network (that is, autonomous system). All neighboring
routers in the same network with the same password will exchange
routing data.
Message Digest Key ID – Assigns a key identifier used in conjunction
◆
with the authentication key to verify the authenticity of routing protocol
messages sent to neighboring routers. (Range: 1-255; Default: none)
Normally, only one key is used per interface to generate authentication
information for outbound packets and to authenticate incoming
packets. Neighbor routers must use the same key identifier and key
value.
When changing to a new key, the router will send multiple copies of all
protocol messages, one with the old key and another with the new key.
Once all the neighboring routers start sending protocol messages back
to this router with the new key, the router will stop using the old key.
This rollover process gives the network administrator time to update all
of the routers on the network without affecting the network
connectivity. Once all the network routers have been updated with the
new key, the old key should be removed for security reasons.
Before setting a new key identifier, the current key must first be deleted
on the Show MD5 Key page.
– 814 –
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