From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Mon Aug 04 2003 - 19:15:57 GMT-3
With IS-IS when you make an interface passive the router removes the "ip
router isis" command from under the interface. See below:
Rack9R4#sho run int lo 0
Building configuration...
Current configuration : 83 bytes
!
interface Loopback0
ip address 196.16.9.4 255.255.255.255
ip router isis
end
Rack9R4#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Rack9R4(config)#router isis
Rack9R4(config-router)#passive-interface lo 0
Rack9R4(config-router)#^Z
Rack9R4#sho run int lo 0
Building configuration...
Current configuration : 66 bytes
!
interface Loopback0
ip address 196.16.9.4 255.255.255.255
end
Rack9R4#
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
-----Original Message-----
From: Tomasz Szymanski [mailto:tomasz.szymanski@trecom.pl]
Sent: Monday, August 04, 2003 3:06 PM
To: Brian Dennis
Cc: 'Tim Fletcher'; ccielab@groupstudy.com
Subject: Re: ISIS passive interface
Are you sure Brian?
I don't see "ip router isis" on Loopback interface so it's not in isis
process.
TS
Brian Dennis wrote:
>With IS-IS when you make the interface passive the router removes the
>"ip router is-is" command from under the interface. So in your case the
>loopback is still being advertised via IS-IS.
>
>Brian Dennis, CCIE #2210 (R&S/ISP Dial/Security)
>brian@labforge.com
>http://www.labforge.com
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Tim Fletcher
>Sent: Wednesday, January 29, 2003 11:53 AM
>To: ccielab@groupstudy.com
>Subject: ISIS passive interface
>
>Hi all,
>
>http://www.cisco.com/en/US/tech/tk472/tk474/technologies_configuration_
e
>xample09186a0080093f38.shtml
>shows the following config:
>
>interface Loopback0
>ip address 172.16.1.1 255.255.255.255
>!--- Creates loopback interface and assigns
>!--- IP address to interface Loopback0.
>!
>interface Ethernet0
>ip address 172.16.12.1 255.255.255.0
>ip router isis
>
>!--- Assigns IP address to interface Ethernet0
>!--- and enables IS-IS for IP on the interface.
>!
>router isis
>passive-interface Loopback0
>net 49.0001.1720.1600.1001.00
>!
>!--- Enables the IS-IS process on the router,
>!--- makes loopback interface passive
>!--- (does not send IS-IS packets on interface),
>!--- and assigns area and system ID to router.
>
>My question is why would you need the passive-interface Lo0 command
>under
>the ISIS config, when ISIS is not configured on Lo0? Isn't this
>redundant?
>
>-Tim Fletcher
>.
>.
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