>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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