At 12:28 AM 4/11/01, Chuck Larrieu wrote:
>So IS-IS does NOT comply with the OSI model? ;->
>
>Seriously, Howard, when you say that IS-IS operates at the MAC layer,
He certainly didn't say that! ;-) He said "ISIS runs directly over the data
link layer." Since I learned protocols the Sniffer way, I understood this
to mean that ISIS packets are encapsulated in 802.3 frames. There is not IP
layer.
Priscilla
>what
>do you mean? When I do a debug isis adjacency on a Cisco router, is what I
>am seeing ( is-is "hello" packets of various sorts, depending on the
>configuration ) evidence of MAC layer activity as opposed to the broadcast
>activity of RIP or the multicast activity of OSPF?
>
>Chuck
>
>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
>Howard C. Berkowitz
>Sent: Tuesday, April 10, 2001 7:37 PM
>To: [EMAIL PROTECTED]
>Subject: RE: Broadcast [7:132]
>
> >Priscilla, does the routing protocol itself deal at the MAC layer? Or is
> >that a function of the router hardware interface process? Well, I suppose
> >with IPX RIP they are one in the same....
> >
> >Chuck
>
>It Depends. ISIS runs directly over the data link layer. All other
>routing protocols hand packets off to the network layer driver and
>let it worry about the data link.
>
> >
> >-----Original Message-----
> >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
> >Priscilla Oppenheimer
> >Sent: Tuesday, April 10, 2001 6:25 PM
> >To: [EMAIL PROTECTED]
> >Subject: Re: Broadcast [7:132]
> >
> >At 07:38 PM 4/10/01, Hingchuen Chan wrote:
> >>Hi guys,
> >>
> >>I read that distance vector routing protocols use the logical broadcast
to
> >>send its periodic update. What MAC address does it use then? Broadcast
>too?
> >
> >Yes, broadcast or multicast.
> >
> >RIPv1 sends to IP destination 255.255.255.255 and Ethernet destination
> >FF:FF:FF:FF:FF:FF. I have also seen RIP implementations that send to
> >0.0.0.0 and implementations that send to network.0, (where the number of
> >zeros depends on class), but all the implementations seem to send to
> >FF:FF:FF:FF:FF:FF at the MAC layer.
> >
> >RIPv2 sends to IP destination 224.0.0.9 and Ethernet destination
> >01:00:5E:00:00:09.
> >
> >Novell IPX RIP sends to IPX destination network.FF:FF:FF:FF:FF:FF and
> >Ethernet destination FF:FF:FF:FF:FF:FF.
> >
> >RTMP sends to DDP destination network.255 and Ethernet destination
> >09:00:07:FF:FF:FF.
> >
> >IGRP sends to IP destination 255.255.255.255 and Ethernet destination
> >FF:FF:FF:FF:FF:FF.
> >
> >EIGRP sends hellos to IP Destination 224.0.0.10 and Ethernet destination
> >01:00:5E:00:00:0A.
> >
> >With OSPF, though not distance vector and not what you asked about, Hello
> >packets are sent to the multicast destination AllSPFRouters. The
Designated
> >Router and its Backup send both Link State Update Packets and Link State
> >Acknowledgment Packets to the multicast address AllSPFRouters, while all
> >other routers send both their Link State Update and Link State
> >Acknowledgment Packets to the multicast address AllDRouters.
> >
> >AllSPFRouters is 224.0.0.5 and 01:00:5E:00:00:05.
> >
> >AllDRouters is 224.0.0.6 and 01:00:5E:00:00:06.
> >
> >>Also, would the recipient of the periodic update send it out again
because
> >>it is a logical broadcast?
> >
> >If the recipient were a switch or bridge, yes. Otherwise, no.
> >
> >Priscilla
> >
> >
> >>Thanks in advance.
> >>
> >>
> >>Hing
> >>_________________________________________________________________________
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> >
> >________________________
> >
> >Priscilla Oppenheimer
> >http://www.priscilla.com
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________________________
Priscilla Oppenheimer
http://www.priscilla.com
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