From: Fred Ingham (fningham@xxxxxxxxxxxxxxxx)
Date: Tue Apr 10 2001 - 16:50:41 GMT-3
Tariq: feff will catch any odd number in the second nibble. There are
protocols that use multicast with an address other than 01 but they are
all odd.
Cheers, Fred
Tariq Sharif wrote:
>
> Sorry guys, I was after generic MAC filtering. e.g. with IRB etc not DLSw+
>
> Ok, here is the question I have:
>
> R2 has IRB running with 1 Ethernet interface, serial & 1 BVI. Configure an
> MAC Address filter on R2 so that it will block broadcast and multicast
> packets for a host on its Ethernet Bridge segment. The filter is shown
> below. Now why is 1st line in the filter with mask of "feff". I know we need
> to match multicasts which start with "0100" but shouldn't the mask for this
> portion be "f0ff" rather than "feff"?
>
> hostname R2
> bridge irb
> interface Ethernet1/0
> no ip address
> bridge-group 1
> bridge-group 1 input-pattern-list 1100
> !
> interface Serial1/0
> ip address 140.1.5.2 255.255.255.0
> interface BVI1
> ip address 140.1.3.2 255.255.255.240
> !
> bridge 1 protocol ieee
> bridge 1 route ip
> !
> access-list 1100 deny 0000.0000.0000 ffff.ffff.ffff 0100.0000.0000
> feff.ffff.ffff
> access-list 1100 deny 0000.0000.0000 ffff.ffff.ffff ffff.ffff.ffff
> 0000.0000.0000
> access-list 1100 permit 0000.0000.0000 ffff.ffff.ffff 0000.0000.0000
> ffff.ffff.ffff
>
> -----Original Message-----
> From: Patrick Murphy [mailto:pjm@roadrunner.nf.net]
> Sent: 10 April 2001 16:04
> To: Tariq Sharif; Ccielab@Groupstudy. Com
> Subject: Re: MAC Address Filter Examples
>
> http://www.cisco.com/warp/public/697/dlswfilter.shtml
>
> The best I have seen yet!
>
> Patrick
>
> ----- Original Message -----
> From: "Tariq Sharif" <tariq_sharif@yahoo.com>
> To: "Ccielab@Groupstudy. Com" <ccielab@groupstudy.com>
> Sent: Tuesday, April 10, 2001 11:49 AM
> Subject: MAC Address Filter Examples
>
> > Does anyone know where I can get MAC Address Filter Examples or info?
> >
> > Many thanks & regards.
> >
> > Tariq Sharif
> >
> > [GroupStudy.com removed an attachment of type application/ms-tnef which
> had a name of winmail.dat]
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