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cabi9876543210
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January 30th, 2013 16:00
powerconnect 6248 jumbo frames support intervlan routing
trying to find out if the 6248 switches support jumbo frames between intervlan routing?
large packet pings in the same vlan work, but when trying to ping between vlans the largest packet size is 1582
where can i get info on the full support of jumbo frames and intervlan routing?
DELL-Willy M
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Posted January 30th, 2013 18:00
The manuals found below are the best resource for the PowerConnect 62xx switch. There are no references to Jumbo Frames with inter-vlan routing. It speaks about enabling the feature on an interface where you can adjust the MTU value.
<ADMIN NOTE: Broken link has been removed from this post by Dell>
The default number of bytes is 1518 (1522 bytes of VLAN-tagged frames).
cabi9876543210
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Posted January 30th, 2013 18:00
Just ended a call with pro support, it seems there is a command to use
(config)interface vlan 110
(config-if-vlan110)#ip mtu 9198
(config-if-vlan110)#ex
(config)#ex
#copy running-config startup-config
9198 is the largest frame size supported under vlan routing
DELL-Willy M
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Posted January 31st, 2013 09:00
Looks like I did not look hard enough either.
Thanks for updating the post with the correct updated information.
cabi9876543210
6 Posts
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Posted January 30th, 2013 18:00
From the manual page 723, I guess I didn't look hard enough and dell support was able to find it for me.
ip mtu
Use the ip mtu command in Interface Configuration mode to set the IP
Maximum Transmission Unit (MTU) on a routing interface. The IP MTU is
the size of the largest IP packet that can be transmitted on the interface
without fragmentation. Use the no form of the command to return the MTU
size to the default value.
Software currently does not fragment IP packets. Packets forwarded in
hardware ignore the IP MTU. Packets forwarded in software are dropped if
they exceed the IP MTU of the outgoing interface. Packets originated on the
router, such as OSPF packets, may be fragmented by the IP stack. The IP
724 IP Routing Commands
stack uses its default IP MTU and ignores the value set using the ip mtu
command. OSPF advertises the IP MTU in the Database Description packets
it sends to its neighbors during database exchange. If two OSPF neighbors
advertise different IP MTUs, they will not form an adjacency (unless OSPF
has been instructed to ignore differences in IP MTU with the ip ospf
mtuignore command).
Syntax
ip mtu integer
• integer — Specifies the distance (preference) of an individual static route.
(Range: 68-9198)
Default Configuration
1500 bytes is the default configuration.
Command Mode
Interface Configuration (VLAN) mode