From: Rajeev Siddappa (raj_lab@xxxxxxxxx)
Date: Sun Oct 21 2001 - 14:56:10 GMT-3
Thank you evry one,
it was great response from you all.
Rajeev.
--- afiddler <afiddler@wi.rr.com> wrote:
> I think Halabi does a really good job of explaining
> BGP route filtering on
> pages 308-316 (new edition).
>
> ----- Original Message -----
> From: "Rick Burts" <burts@mentortech.com>
> To: "Brian Hescock" <bhescock@cisco.com>
> Cc: "Rajeev Siddappa" <raj_lab@yahoo.com>;
> <ccielab@groupstudy.com>
> Sent: Sunday, October 21, 2001 5:42 AM
> Subject: Re: Wiered - Access list.
>
>
> > Actually it is not a mistake. This is an
> application of extended access
> > list used in BGP processing. In this context you
> interpret the 4
> > parameters as: network (address), mask on network
> (how many bits of the
> > address need to match), subnet mask, mask on
> subnet mask (how many bits
> > of the subnet mask are significant) rather than
> the traditional source
> > address, source mask, destination address,
> destination mask.
> >
> > You would interpret this as permit advertisement
> of 192.169.192.0
> > 255.255.248.0 but it would not permit
> advertisement of 192.168.192.0
> > 255.255.240.0.
> >
> > This implementation is a bit complex. It is the
> early version of the
> > function supplied by prefix list for BGP and does
> the same thing: allow
> > filtering on both address and mask length.
> >
> > Rick
> >
> > Rick Burts, CCSI CCIE 4615
> burts@mentortech.com
> > Mentor Technologies 240-568-6500
> ext 6652
> > 133 National Business Parkway 240-568-6515
> fax
> > Annapolis Junction, Md 20701
> >
> > Chesapeake Network Solutions has now become Mentor
> Technologies.
> > Mentor Technologies is a certified Cisco Training
> Partner and also
> > a Cisco Professional Services partner.
> > We offer most of the Cisco training courses.
> > We also offer training in Checkpoint Firewall
> software and
> > Fore Systems (now Marconi) and MicroMuse.
> > We also provide network consulting services
> including
> > design, management, and problem solving.
> > We have 21 CCIEs on our staff.
> > We offer the breakthrough VLAB remote access
> technology for
> > access to practice configuration on real
> equipment.
> >
> > On Sat, 20 Oct 2001, Brian Hescock wrote:
> >
> > > It doesn't seem like anyone is on-line tonight
> so I'll go ahead and
> > > answer: it's a mistake. He put in a subnet
> mask instead of a host
> > > address. It's not you... ;-)
> > >
> > > Brian
> > >
> > > Rajeev Siddappa wrote:
> > >
> > > >Hi friends,
> > > >
> > > >Can any one explain me how this access-list
> works.
> > > >
> > > >access-list 101 permit IP host 192.169.192.0
> host
> > > >255.255.248.0
> > > >
> > > >This is an example in Jeff-doyel vloume 2 page
> 189.
> > > >
> > > >Please I am breaking my head.
> > > >
> > > >Thank you,
> > > >Rajeev.
> > > >
> > > >
> > >
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