From: John Matijevic (matijevi@bellsouth.net)
Date: Mon Aug 04 2003 - 21:31:36 GMT-3
Hello Team,
Could somebody provide an example of when you would want to put an interface
in passive mode under ISIS? I have not run into this situation yet. I was
not able to access the link below.
Sincerely,
Matijevic
----- Original Message -----
From: "MMoniz" <ccie2002@tampabay.rr.com>
To: "Brown, Patrick (NSOC-OCF}" <PBrown4@chartercom.com>; "'Tomasz Szymanski
'" <tomasz.szymanski@trecom.pl>; "'Brian Dennis '" <brian@labforge.com>
Cc: "''Tim Fletcher' '" <tim@fletchmail.net>; <ccielab@groupstudy.com>
Sent: Monday, August 04, 2003 7:48 PM
Subject: RE: ISIS passive interface
> Interesting. I did not know this but it works. I still notice however
these
> nets are not
> redistributed as usual so they must be include in the connected
> redistribution for other
> protocols.
>
> Thanks Patrick
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Brown, Patrick (NSOC-OCF}
> Sent: Monday, August 04, 2003 6:45 PM
> To: 'Tomasz Szymanski '; 'Brian Dennis '
> Cc: ''Tim Fletcher' '; 'ccielab@groupstudy.com '
> Subject: RE: ISIS passive interface
>
>
> By putting the loopback interface in passive mode(passive interface
> loopback 0), it is automatically made apart of the ISIS routing process.
> This is not the same for other routing protocols. You can do "ip router
> isis" on interface to put the loopback into the ISIS process, but this
will
> waste alot of CPU processing. When putting the lo0 interface in passive
mode
> under ISIS, you DO NOT need the "ip router isis" command on the loopback 0
> to advertise into ISIS process.
> HTH
>
> Patrick
> -----Original Message-----
> From: Tomasz Szymanski
> To: Brian Dennis
> Cc: 'Tim Fletcher'; ccielab@groupstudy.com
> Sent: 8/4/2003 5:05 PM
> 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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