Show size of MTU EXOS

  • 9 January 2017
  • 5 replies

Userlevel 5
I can find all the commands for configuring jumbo frames and MTU in EXOS but I can't find the commands to show existing (currently default) MTU. I can only search the config and see jumbo enabled on a port. (show config detail does not work either)

Where do I find this information on the switch?

5 replies

Userlevel 5

Happy New Year! The command is "show port <#> info detail" - It will show you how the port is configured as well as the MTU - See below:

Port: 1 Virtual-router: VR-Default
Type: UTP
Random Early drop: Unsupported
Admin state: Enabled with auto-speed sensing auto-duplex
Link State: Ready
Link Ups: 2 Last: Mon Jan 09 08:35:30 2017
Link Downs: 2 Last: Mon Jan 09 08:46:11 2017

VLAN cfg:
Name: billhome, Internal Tag = 100, MAC-limit = No-limit, Virtual router: VR-Default
STP cfg:

Name: billhome Protocol: ANY Match all protocols.
Trunking: Load sharing is not enabled.

EDP: Enabled

EEE: Disabled
ELSM: Disabled
Ethernet OAM: Disabled
Learning: Enabled
Link-Flap Detection: Disabled
Unicast Flooding: Enabled
Multicast Flooding: Enabled
Broadcast Flooding: Enabled
Jumbo: Enabled, MTU= 9216
Flow Control: Rx-Pause: Enabled Tx-Pause: Disabled
Priority Flow Control: Disabled
Reflective Relay: Disabled
Link up/down SNMP trap filter setting: Enabled
Egress Port Rate: No-limit
Broadcast Rate: No-limit
Multicast Rate: No-limit
Unknown Dest Mac Rate: No-limit
QoS Profile: None configured
Ingress Rate Shaping : Unsupported
Ingress IPTOS Examination: Disabled
Ingress 802.1p Examination: Enabled
Ingress 802.1p Inner Exam: Disabled
Ingress 802.1p Priority: 0
Egress IPTOS Replacement: Disabled
Egress 802.1p Replacement: Disabled
NetLogin: Disabled
NetLogin port mode: Port based VLANs
Smart redundancy: Enabled
Software redundant port: Disabled
IPFIX: Enabled Metering: Ingress, All Packets, IPv4
IPv4 Flow Key Mask: SIP: DIP:
IPv6 Flow Key Mask: SIP: ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
DIP: ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

auto-polarity: Enabled
Shared packet buffer: default
VMAN CEP egress filtering: Disabled
Isolation: Off
PTP Configured: Disabled
Time-Stamping Mode: None
Synchronous Ethernet: Disabled
Dynamic VLAN Uplink: Disabled
VM Tracking Dynamic VLANs: Disabled
Userlevel 7
I see Bill beat me to it, but since I had this typed, I'll post anyway :)

The default MTU is 1500. The [code]configure jumbo-frame-size[/code] command is used to change it, once enabled.
The value can be seen in show port info detail output.

That "Jumbo" line will look like this when enabled (or if otherwise configured):
Jumbo: Enabled, MTU= 9216[/code]There's likely another location to see this configuration, but it's not coming to me right now and I couldn't find it right away.
Userlevel 4
Important to remember, jumbo-frame needs to be enabled for switching jumbo packets.
ip-mtu needs to be increased to route jumbo packets.

If only ip-mtu is increased without the ports being jumbo-frame enabled you will get an error indicating jumbo-frames needs to be enabled on the ports. Hence please make sure to enable those before applying this settings.

As Drew said earlier there is another location to check the configured MTU hence please look at the below articles for more info:

This would specify you the IP-MTU value configured on a vlan
Userlevel 5
Thanks everyone .
Userlevel 4
Hope this clarifies your query posted here. If so then let us close this thread communication in case if there is no more concern left for this question.