Re: IS-IS Ether type

It's part of an LLC header. So 0xFE is what you'll look for in the DSAP
field.

Now, IS-IS has a specific NLPID on top of that (separating it from other
CLNS packets), but I'd hazard a guess that you really aren't going to
run across any other CLNS packets these days, so you likely don't really
care about further separation!

:)

*Scott Morris*, CCIE/x4/ (R&S/ISP-Dial/Security/Service Provider) #4713,

CCDE #2009::D, CCNP-Voice, JNCIE-SP #153, JNCIE-ER #102, CISSP, et al.

CCSI #21903, JNCI-SP, JNCI-ER

swm_at_emanon.com

Knowledge is power.

Power corrupts.

Study hard and be Eeeeviiiil......

On 10/1/11 8:12 AM, Routing Freak wrote:
> Hi fellas,
>
> How to block IS-IS Control Plane packets using access-list. What is the
> ether type for IS-IS Packets. Can anyone help me out on how to prevent IS-IS
> traffic. We cannot use IP ACL to block IS-IS traffic. So we have to write
> MAC ACL to prevent ISIS control packets ?
>
> Thank You
>
>
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Received on Sat Oct 01 2011 - 09:27:18 ART