Le 21/10/2010 11:21, Antonio Querubin a écrit :
On Thu, 21 Oct 2010, Daniel Hooper wrote:
I was under the impression that interfaces handling Q-in-Q needed
atleast an MTU of 1504 bytes.
The 7206 doesn't accept anything higher than 1500 on that interface.
I did some testing with the carrier today and we found that 1490 was the
highest MTU that would reliably allow web browsing. One would think that
1496 or 1492 would do the trick but 1492 didn't make a difference. There
was some useability at 1491.
Antonio Querubin
808-545-5282 x3003
e-mail/xmpp: t...@lava.net
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Hi,
On this kind of router :
core4.rou01#sh ver | inc IOS
IOS (tm) 7200 Software (C7200-P-M), Version 12.3(19), RELEASE SOFTWARE (fc2)
This Version of Cisco IOS Software is not supported on NPE300.
Please select a version of Cisco IOS software compatible with
core4.rou01#sh run int gi 0/0
Building configuration...
Current configuration : 167 bytes
!
interface GigabitEthernet0/0
mtu 1530
ip address x.x.x.x 255.255.255.252
duplex full
speed 1000
media-type gbic
negotiation auto
tag-switching ip
end
core4.rou01# ping y.y.y.y si 1520
Type escape sequence to abort.
Sending 5, 1520-byte ICMP Echos to 217.169.255.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
core4#
You could be able to set mtu higher than 1500, so that you can handle
q-in-q frames.
<off topic>
I am interested in what kind of router are terminating your Q-in-Q vlan ?
</off>
--
Christophe Lucas - Network Engineer - c.lu...@infosat-telecom.fr
Tel : +33(0)974.762.595 - Fax : +33(0)09.72.19.53.58
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