Doesn't RIP 'route by rumours' - ie: only exchange updates with its
immediate neighbours. A TTL of 2 would acheive this as it will not be
forwarded past the immediate neighbour (the TTL is decremented and if the
next hop of a packet with a TTL of 1 is not directly connected to the router
then the packet is dropped)
Not familiar with the other equipment you mention, but perhaps the
difference is the starting point of the hop count (one vendor interprets
outgoing hops as opposed to incoming hops)?
Just my thoughts...
Keith
"Lance Simon" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi group!
>
> I am a lurker at best here, but today I saw something that really
> puzzled me. While I was looking at a trace file I noticed something
> unusual about the ttl values for RIP updates on a PacketEngines switch.
> This switch is connected to a Cat5000 and I had a sniffer in between the
>
> two.
> My understanding of RIP is that the ttl value = 2 and that it is
> decremented as it enters a switch/router and then it is looked at.
> Therefore, a ttl=2 would become ttl=1 before the packet is even looked
> at. If the ttl=1 it would become ttl=0 and then, instead of being
> looked at, it would be discarded. Is this correct?
> First, let me say that the Packet Engines 2200 switch is a very good box
>
> and it is communicating well with the Cat5k. The RIP updates are being
> handled well by both sides, but; when looking at the sniff, the ttl
> value from the packet Engines box is set to =1. How can this be?
> Do I totally misunderstand the UDP ttl value in relationship to RIP?
> Any insights would be helpful. BTW, I have got a call into a
> PacketEngines s/w engineer and am waiting for a response.
>
> Thanks,
>
> Lance
>
>
>
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