Hi Chuck,
I'm not a 100% sure myself but I believe the delineation is that layer 3
fragmentation is seperate from ATM SAR.
SAR simply takes the layer 3 packet and chops it into 48 byte payloads and
reassembles it at the other end of the ATM link, the actual content of the
payload, the packet itself is irrelevant to that level.
At any rate we have seen sinificant improvements in BGP using an MTU of 4470 on
Gig and OC3 ATM so I want to try and increase the MTU on the link between
another couple of routers.
Darren
Chuck Larrieu wrote:
> Not knowing the ethernet side of things, but I am curious - and MTU of 4470
> on ATM? 53 byte cell size?
>
> I did a cursory search of the IEEE web site but didn't find much.
>
> Chuck
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
> Darren Ward
> Sent: Friday, December 01, 2000 7:02 PM
> To: [EMAIL PROTECTED]
> Subject: Fast Ethernet MTU Size
>
> Hi All,
>
> Is it at all possible to raise the MTU size on Fast Ethernet?
>
> I'll give you all a scenario....
>
> ATM on one side with an MTU of 4470, fast ethernet connecting the two
> routers, Gigabit Ethernet the other side with an MTU of 4470.
>
> How can I raise the MTU of a Full Duplex Fast Ethernet Connection above
> 1500?
>
> I assume it's not possible when going through switched as they will show
> every packet as a giant but in a router to router cross-over connection
> I was hoping there was some way to keep the MTU static across the path
> rather than force the routers to fragment and re-assemble (of course the
> destination re-assembles).
>
> Darren Ward
> CCNP, CCDP, CCIE Wannabee
>
> _________________________________
> FAQ, list archives, and subscription info:
> http://www.groupstudy.com/list/cisco.html
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
_________________________________
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
