06-19-2019 02:02 AM
Hi Guys,
Can someone explain to me the MTU configuration on Nexus 5500?
I have MTU set globally to jumbo as bellow:
policy-map type network-qos jumbo class type network-qos class-default mtu 9216 multicast-optimize system qos service-policy type network-qos jumbo
When I look at interface MTU queuing, I see the MTU is correct:
gefdc02# sh queuing interface e1/37 Ethernet1/37 queuing information: TX Queuing qos-group sched-type oper-bandwidth 0 WRR 100 RX Queuing qos-group 0 q-size: 469760, HW MTU: 9216 (9216 configured) drop-type: drop, xon: 0, xoff: 469760 Statistics: [...] Per-priority-pause status : Rx (Inactive), Tx (Inactive) Total Multicast crossbar statistics: Mcast pkts received from the cross-bar : 99461929
But when I look at interface itself, MTU is still 1500:
gefdc02# sh int e1/37 Ethernet1/37 is up Dedicated Interface Belongs to Po45 Hardware: 1000/10000 Ethernet, address: 002a.6ad8.05ac (bia 002a.6ad8.05ac) Description: fonesxcore01-esx MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA Port mode is trunk full-duplex, 10 Gb/s, media type is 10G Beacon is turned off Input flow-control is off, output flow-control is off Rate mode is dedicated Switchport monitor is off EtherType is 0x8100 [...]
Also, note that interface e1/37 is member of a Port-Channel which in turn is member of a vPC.
Is it a normal behavior?
Thanks & Best Regards,
Jean-Christophe
Solved! Go to Solution.
06-19-2019 02:35 AM - edited 06-19-2019 02:41 AM
Hi
Thats right just the way 5K is , its set globally , on 9k you can actually change it per interface but once you have set it as globally on 5k thats right , we have it set ourselves , the 9ks you will actually see it under interface too
mine
policy-map type network-qos jumbo
class type network-qos class-default
mtu 9216
multicast-optimize
sh int e1/10 | i MTU
# MTU 1500 bytes, BW 10000000 Kbit,, BW 10000000 Kbit, DLY 10 usec
06-19-2019 02:35 AM - edited 06-19-2019 02:41 AM
Hi
Thats right just the way 5K is , its set globally , on 9k you can actually change it per interface but once you have set it as globally on 5k thats right , we have it set ourselves , the 9ks you will actually see it under interface too
mine
policy-map type network-qos jumbo
class type network-qos class-default
mtu 9216
multicast-optimize
sh int e1/10 | i MTU
# MTU 1500 bytes, BW 10000000 Kbit,, BW 10000000 Kbit, DLY 10 usec
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