From: Alexey Tolstenok (alextols@gmail.com)
Date: Thu Nov 09 2006 - 09:09:14 ART
Hello group,
I've discovered some strange thing with subj. If I wanna put several
interfaces in area with one network command.
154.1.3.3/24, 154.1.13.3/24 , 154.1.23.3/24
My solution is through wildcard as usual with access-lists but...
CCIE-R3(config-router)#network 192.168.13.3 0.0.30.0 a 0
OSPF: Invalid address/mask combination (discontiguous mask)
After some investigation I researched that here only allowed to add "inverse
mask"
No "0" after 1st zero allowed:
CCIE-R3(config-router)#network 192.168.13.3 0.0.30.255 a 0
OSPF: Invalid address/mask combination (discontiguous mask)
CCIE-R3(config-router)#network 192.168.13.3 0.0.31.255 a 0
CCIE-R3(config-router)#
In UniverCD says:
The Cisco IOS software sequentially evaluates the *ip-addres*s *
wildcard-mask* pair for each interface as follows:
* 1. *The *wildcard-mask argument* is logically ORed with the interface IP
address.
* 2. *The *wildcard-mask argument* is logically ORed with the ip-*address
argument *in the *network* command.
* 3. *The software compares the two resulting values. If they match, OSPF is
enabled on the associated interface and this interface is attached to the
OSPF area specified.
What is going on?
-- SY, Alexey
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