Nexus5548up - Is my etherchannel really 20G ?

[graham smart]

Hi Guys,

Im having trouble verifying an etherchannel on my nexus and 6500..

Now.

I have a VSS distribution layer ( 2x 6500's ) and a bunch of nexus switches plugged into it.

The nexus switch as 1x 10g to one switch and 1x 10g to another in an etherchannel. (MEC)

Same on the VSS, its an etherchannel.

What I cant seem to figure out is if its really up at 20G due to the 2x links in the MEC.

A show int always shows 10G but it does show the members.. So with two members it should be a 20G agreggated MEC..

I had set my BS statement to 20000 but I dont think that really matters anyway..

The same goes for the 6500 end. Its a 10G UP UP port channel. No mention of 20G.

How can I be 100% sure that it is infact running 20G

Thanks

G

port-channel1 is up

  Hardware: Port-Channel, address: 547f.ee8c.9ae8 (bia 547f.ee8c.9ae8)

  Description: MEC01

  MTU 1500 bytes, BW 20000 Kbit, DLY 10 usec

  reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA

  Port mode is trunk

  full-duplex, 10 Gb/s

  Input flow-control is off, output flow-control is off

  Switchport monitor is off

  EtherType is 0x8100

  Members in this channel: Eth1/1, Eth1/2

  Last clearing of "show interface" counters never

  30 seconds input rate 4824 bits/sec, 3 packets/sec

  30 seconds output rate 4296 bits/sec, 3 packets/sec

  Load-Interval #2: 5 minute (300 seconds)

    input rate 2.03 Kbps, 2 pps; output rate 960 bps, 0 pps

  RX

    43 unicast packets  28 multicast packets  1 broadcast packets

    72 input packets  8909 bytes

    0 jumbo packets  0 storm suppression bytes

    0 runts  0 giants  0 CRC  0 no buffer

    0 input error  0 short frame  0 overrun   0 underrun  0 ignored

    0 watchdog  0 bad etype drop  0 bad proto drop  0 if down drop

    0 input with dribble  0 input discard

    0 Rx pause

  TX

    30 unicast packets  24 multicast packets  3 broadcast packets

    57 output packets  9612 bytes

    0 jumbo packets

    0 output errors  0 collision  0 deferred  0 late collision

    0 lost carrier  0 no carrier  0 babble 0 output discard

    0 Tx pause

  3 interface resets

-- CFG

interface port-channel1

  description MEC01

  switchport mode trunk

  switchport trunk allowed vlan 1

  duplex full

  bandwidth 20000

interface Ethernet1/1

  description MEC01

  switchport mode trunk

  switchport trunk allowed vlan 1

  speed auto

  duplex full

  channel-group 1

interface Ethernet1/2

  description MEC01

  switchport mode trunk

  switchport trunk allowed vlan 1

  speed auto

  duplex full

  channel-group 1

[graham smart]

Im fairly sure its all ok.. Just need someone to confirm my thinking

Im assuming that in reality you only get a 10G "flow" at any one time. So you could have multiple flows balanced across the links getting 20G through multiple flows.

[glen.grant · Accepted solution]

  On a given channel any single conversation will only flow down a single interface of the channel so your total thruput for a given conversation will be 10  gig .  You have 20 gig of pipeline to push all traffic as some traffic will go down one interface and some will go down the other interface depending on dist. algorithim you choose.

[graham smart]

OK cool,

Thanks for your input.

So as I thought, Id get a max of 10G at any one time, However with muplti flows using multiple paths it could do 20G worth of throughput but at a max of 10G on any given flow?

-G