4 Fast Ethernet Switch Management Guide

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IP Routing Commands

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• authentication - Specifies the authentication mode. If no optional

parameters follow this keyword, then plain text authentication is used along

with the password specified by the authentication-key. If message-digest

authentication is specified, then the message-digest-key and md5

parameters must also be specified. If the null option is specified, then no

authentication is performed on any OSPF routing protocol messages.

• message-digest - Specifies message-digest (MD5) authentication.

• null - Indicates that no authentication is used.

• hello-interval seconds - Specifies the transmit delay between sending

hello packets. Setting the hello interval to a smaller value can reduce the

delay in detecting topological changes, but will increase the routing traffic.

This value must be the same for all routers attached to an autonomous

system. (Range: 1-65535 seconds; Default: 10 seconds)

• retransmit-interval seconds - Specifies the interval at which the ABR

retransmits link-state advertisements (LSA) over the virtual link. The

retransmit interval should be set to a conservative value that provides an

adequate flow of routing information, but does not produce unnecessary

protocol traffic. However, note that this value should be larger for virtual

links. (Range: 1-3600 seconds; Default: 5 seconds)

• transmit-delay seconds - Estimates the time required to send a link-state

update packet over the virtual link, considering the transmission and

propagation delays. LSAs have their age incremented by this amount

before transmission. This value must be the same for all routers attached

to an autonomous system. (Range: 1-3600 seconds; Default: 1 seconds)

• dead-interval seconds - Specifies the time that neighbor routers will wait

for a hello packet before they declare the router down. This value must be

the same for all routers attached to an autonomous system.

(Range: 1-65535 seconds; Default: 4 x hello interval, or 40 seconds)

• authentication-key key - Sets a plain text password (up to 8 characters)

that is used by neighboring routers on a virtual link to generate or verify the

authentication field in protocol message headers. A separate password can

be assigned to each network interface. However, this key must be the same

for all neighboring routers on the same network (i.e., autonomous system).

This key is only used when authentication is enabled for the backbone.

• message-digest-key key-id md5 key - Sets the key identifier and

password to be used to authenticate protocol messages passed between

neighboring routers and this router when using message digest (MD5)

authentication. The key-id is an integer from 1-255, and the key is an

alphanumeric string up to 16 characters long. If MD5 authentication is used

on a virtual link, then it must be enabled on all routers within an autonomous

system; and the key identifier and key must also be the same for all routers.

Command Mode

Router Configuration