So far I've seen two conflicting answers...
>>> "Thomas Nooning" 9/23/2004 4:50:28 PM >>>
The 'network' statement in OSPF doesn't specify what networks are
advertised, but what *interfaces* will participate in what OSPF area.
In
your example your saying "any interface with an IP in the range of
172.1.0.0/16 be in area 0 and any interface with an IP in the range of
172.1.1.0/24 be in area 1".
A quick test shows that an interface in the /24 range will superscede
the
/16 assignment and be in area 1.
HTH,
Tom
>>> "Howard C. Berkowitz" 9/23/2004 5:27:30 PM >>>
No. Like access-lists, this is strictly order-dependent. First match
wins.
This is a reason that I prefer to keep complex OSPF configurations on
a server, and precede them with "no ospf xxx". It's far too easy to
get conflicting results by appending rather than inserting a network
statement.
Also helping protect against such errors is always using the mask
0.0.0.0 on network statements, unless it's for the very special case
where you want to override next-hop. Yes, it makes for more
statements -- but I find it easier to check the configuration when
there is a one-to-one correspondence between OSPF enabled interfaces
and network subcommands.
Jesse McGraw wrote:
>
> Let's say I have this OSPF config:
>
> ROUTER OSPF 10
> network 172.1.0.0 0.0.255.255 area 0
>
>
> and I add:
> network 172.1.1.0 0.0.0.255 area 1
>
> which area will 172.1.1.0 be advertised in? Will the more
> specific
> statement override the more general one even though it comes
> later in
> the config?
>
>
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