>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
None of the above.
IS-IS
802.2
MAC layer
as opposed to
RIP BGP OSPF (E)IGRP
UDP TCP (none) (none)
------------------802.2---------------
MAC layer
>
>>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
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=257&t=132
--------------------------------------------------
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
