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Posted by charset on May 10, 2008, 1:45 pm
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Dear group,
I am an MSc student in Electrotechnical Engineering and I am currently
researching configuration commands in Cisco IOS for my thesis.
In particular, I am interested in setting the administrative distance
of a route according to the route's destination prefix. I am aware of
the "distance" command in the form:
distance {ip-address } [ip-standard-list] [ip-
extended-list]
which allows one to set the administrative distance of a route (within
the configuration of a particular routing protocol) according to what
Cisco's documentation [1] refers to as the "source of a route". The
documentation is not very clear on what this means, but my
interpretation is that it refers to the neighboring router from which
the route in question was received. On the other hand, the book "Cisco
IOS in a nutshell" says it refers to the route's destination address;
confusingly, it also describes the command's syntax as
distance distance [address mask] [access-list]
which is missing one argument relative to the version above.
Since the two sources contradict each other, I wonder if you could
provide me an answer to any of the following questions:
(i) What is the correct syntax of the "distance" command and, in
particular, what do the ip-address and wildcard-mask parameters mean;
(ii) Is there any way, using this command or another one, to set a
route's administrative distance based on the route's destination
prefix/address?
Thanks in advance.
Best regards,
Tiago
[1] Cisco IOS IP Command Reference, Volume 2 of 3: Routing Protocols,
Release 12.2
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Posted by Merv on May 10, 2008, 3:53 pm
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The syntax for the distance command is
distance <admin-distance> {ip-address } [ip-standard-
list]| [ip-extended-list]
example: distance 150 10.1.1.0 0.0.0.255
This distance command should not be confused with route metrics that
are used
by the various routing protocols - RIP, EIGRP, OSPF, ISIS, etc
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