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12-11-2013 01:28 AM - edited 12-11-2013 01:31 AM
12-11-2013 01:28 AM - edited 12-11-2013 01:31 AM
2530 switch(J9779A) jumbo configuration
Hi, I am trying to disable jumbo frame on the switch. In the configuration guide it's told that I should use following commands for it: "no vlan 999 jumbo". However the command seems to be not recognized by the switch:
hostname(config)# no vlan 999 jumbo
Invalid input: jumbo
hostname(config)# no vlan 999 ?
disable Enable or disable various features on the device.
forbid Prevent ports from becoming a member of the current VLAN.
ip Configure various IP parameters for the VLAN.
ipv6 Configure various IPv6 parameters for the VLAN.
protocol Set a predefined protocol for the current VLAN.
qos Set VLAN-based priority.
tagged Assign ports to current VLAN as tagged.
untagged Assign ports to current VLAN as untagged.
voice Usage: [no] voiceDescription: Labels this VLAN as a Voice VLAN, allowing you to separate, prioritize, and authenticate voice traffic moving through your network.
<cr>.
Switch itself supports jumbo frames:
hostname# sh vlan 999
Status and Counters - VLAN Information - VLAN 999
VLAN ID : 999
Name : Dummy
Status : Port-based
Voice : No
Jumbo : Yes
Firmware version: YB.15.12.0010
Please advice how to solve the issue?
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12-15-2013 09:50 AM
12-15-2013 09:50 AM
Re: 2530 switch(J9779A) jumbo configuration
HP 2530-24-PoE+ Switch has 24 10/100 ports and only 4 Gigabit ports.
A requirement for enabling jumbo frames is that the port is gigabit capable
From the manual:
Ports operating at a minimum of 1 Gbps can accept forward frames of up to 9220
bytes (including four bytes for a VLAN tag) when configured for jumbo traffic. You can enable
inbound jumbo frames on a per-VLAN basis. That is, on a VLAN configured for jumbo traffic, all
ports belonging to that VLAN andoperating at a minimum of 1 Gbps allow inbound jumbo frames
of up to 9220 bytes.
So since most of the ports here dont support Gigabit I am not sure whether this feature is available on this switch at all.
I checked the specification and found the following information:
Jumbo packet support
supports up to 9220-byte frame size to improve the performance of large data transfers; 8- and 24-port Fast Ethernet models automatically support up to 2000-byte frames with no configuration needed
So probably the jumbo-output in show vlan refers to this 2000 byte frames or is just a bug.
Not configuration is need, which probably means that it cannot be disabled as well.
Maybe you could check whether this command is available so you can adjust the max frame size
jumbo max-frame-size
Hope this helps.
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12-15-2013 10:55 PM
12-15-2013 10:55 PM
Re: 2530 switch(J9779A) jumbo configuration
Emil is spot on..
This model provides options to toggle between 2000/9220 using max-frame-size - they dont have an option to disable jumbo explicity.
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12-17-2013 04:44 AM
12-17-2013 04:44 AM
Re: 2530 switch(J9779A) jumbo configuration
Thanks Emil, bibma for your replies.
My issue is that another HP switch connected to 2530 does not support jumbo frames and whenever it recieves frame bigger than 1514 bytes it complains in logs and increases error counter. So my intention was to made MTU equal on both switches so that jumbo frames are dropped on the network edge.
Can you give me any advice on how to get rid of error counter triggering and excessive logging?