can't see arp when I type sh arp on C6506 core switch

Unanswered Question
Jul 25th, 2007


When I type sh arp on C6506 core switch can't see the arp table. Any idea ?

I have this problem too.
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jay77jay77 Wed, 07/25/2007 - 23:30

you may trying after telneting into the MSFC using the session command.

Possibly you might not see the ARP at the switch level.


mohammedmahmoud Wed, 07/25/2007 - 23:37


Most probably you are using Hybrid mode (CatOS), and thus you can see the ARP table on the MSFC and not on the Supervisor (on the supervisor you'll only get the management VLAN interface).


Mohammed Mahmoud.

jay77jay77 Wed, 07/25/2007 - 23:48

Hi Mohammed,

Im bit confused here- is it correct to say that MSFC runs its own IOS and the SUPengine runs its own catOS. Is it ture..

Or is it recently been that, only a single IOS is loaded into the switch ?


mohammedmahmoud Thu, 07/26/2007 - 00:01


In the hybrid mode, two separate image files are managed by the two different operating systems. The CatOS images are stored on the Supervisor bootflash or flash cards (PCMCIA for Supervisor 1A and Supervisor 2, and Compact Flash for both the Supervisor Engine 32 and Supervisor Engine 720). The Cisco IOS image for the MSFC is stored on the MSFC bootflash.

As for the Native mode Cisco IOS Software requires the single image be present on a device local to the Supervisor because it is a bundled image for the two processors, and the SP boots first. The image can reside either on the Supervisor bootflash (sup-bootflash:) or the flash card (slot0: or disk0:); it cannot reside on the MSFC bootflash.


Mohammed Mahmoud.


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