Article View: comp.dcom.sys.cisco
Article #244Interface configured with ip address but shutdown, reacts to an ARP
From: Sunil Kishen
Date: Wed, 19 Aug 1992 22:46
Date: Wed, 19 Aug 1992 22:46
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Here is the scenario:
[int e 1 : 143.183.3.1 up ]____________[int e 1 :143.183.3.5 up]
[int e 2 : 143.183.3.5 down] [ ]
Router A Router B
Pinging router A's int e 1 from Router B... no response.
Looked at the arp cache of router A, noticed that it had the ethernet
address of its own int e 2(which is administratively shutdown).
Cleared the arp cache, but it refreshed it self immediately with the
hardware address of the shutdow interface.
Therefore I conclude that: Even if an interface is administratively shutdown,
line protocol down, the router caches the hardware address if it has
been assigned an ip address. Is this a bug or a feature?
Sunil.
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arc1-ca.pugleaf.net!sparky!uunet!kithrup!stanford.edu!ames!elroy.jpl.nasa.gov!usc!sol.ctr.columbia.edu!eff!iWarp.intel.com|inews.Intel.COM!xanadu!skishenShow Full Headers
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Newsgroups: comp.dcom.sys.cisco Path: arc1-ca.pugleaf.net!sparky!uunet!kithrup!stanford.edu!ames!elroy.jpl.nasa.gov!usc!sol.ctr.columbia.edu!eff!iWarp.intel.com|inews.Intel.COM!xanadu!skishen From: skishen@xanadu.intel.com (Sunil Kishen) Subject: Interface configured with ip address but shutdown, reacts to an ARP Message-ID: <Bt95yB.35v@nntp-sc.Intel.COM> Sender: news@nntp-sc.Intel.COM (USENET News System) Nntp-Posting-Host: xanadu Reply-To: skishen@xanadu.intel.com (Sunil Kishen) Organization: Intel Corporation, Santa Clara, CA USA Date: Wed, 19 Aug 1992 22:46:59 GMT Lines: 24