From: Bryant, Paul M (paul.m.bryant@uk.verizonbusiness.com)
Date: Wed May 24 2006 - 07:53:00 ART
Thanks for the answer. I had seen the bandwidth statement on the tunnel int
also.
So does this mean the router will limit the tunnel bandwidth to the physical
bandwidth, assuming it works this out from unicast routing table?
Or will it let the tunnel attempt to have more bandwidth than the physical
meduim has causing congestion i.e. you might be advised to shape/police gre
on a physical int to avoid saturating it? If you have two paths to the
tunnel dest. or you load sharing two it other unequal paths how would it
know this? As this is IP there are no messages to tell the gre to slow down.
I am just trying to understand how it works as I hadnt thought about tunnels
much more than getting the source/dest correct and running IP over them.
-----Original Message-----
From: Alexei Monastyrnyi [mailto:alexeim@orcsoftware.com]
Sent: 24 May 2006 11:41
To: Bryant, Paul M
Cc: Cisco certification
Subject: Re: Tunnel Bandwidth
As command reference states for 12.4
"Usage Guidelines Use the *tunnel bandwidth* command to specify the capacity
of the satellite link." See also example.
By default administrative bandwidth for Tunnel interface is 9Kbit/sec.
But this is mostly reference for routing protocols. Physically it transmits
at underlaying interface speed, considering any shaping/policing applied to
the one.
A.
on 24/05/2006 12:24 Bryant, Paul M wrote:
> Hi
>
> I have been doing some labs with tunnels and have been using GTS to
> shape traffic on a tunnel interface. I noticed that there seems to be
> a setting called
>
> Tunnel transmit bandwidth 8000 (kbps)
> Tunnel receive bandwidth 8000 (kbps)
>
> Automatically on the tunnel int. I have tested with pings with timeout
> 0 to get as much traffic through the tunnel as possible but it doesn't
> seem to limited by this command. Does anyone know if you can change
> this or what it means? Also as default what is the throughput of a
> tunnel, as much as the router can cope with sending or is there a
> limit imposed by IOS? This is just an ordinary ipv4 gre tunnel on
> device IOS 12.4/12.3T
>
> TIA
>
> Paul
>
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