N2k ether_channel with IBM EN4093R Low bandwidth

[mrabdulhamid]

  We are trying to connect our Flex chassis to two Cisco Nexus 2K (port-channel and VPC)  ,all VLANs are working properly for the servers.

But we are trying to increase the bandwidth ,connecting 2x10Gbps uplinks from each EN4093 to the N2K, but the bandwidth seems to be very low.

EN4093 configuration:

*****************FLEX_SW_1***************

interface port EXT1
        tagging
        tag-pvid
        pvid 240
        exit
!       
interface port EXT2
        tagging
        tag-pvid
        pvid 240
        exit

vlan 1  
        member INTA5-INTA14,EXT1-EXT4,EXT6-EXT10
        no member INTA1-INTA4,EXT5
!       
vlan 220
        enable
        name "VLAN 220"
        member EXT1-EXT4
!       
vlan 230
        enable
        name "VLAN 230"
        member EXT1-EXT4
!       
vlan 240
        enable
        name "VLAN 240"
        member INTA1-INTA4,EXT1-EXT5

interface port EXT1
        lacp mode active
        lacp key 10
!       
interface port EXT2
        lacp mode active
        lacp key 10

******************* FLEX_SW_2******************

interface port EXT1
        tagging
        tag-pvid
        pvid 240
        exit
!       
interface port EXT2
        tagging
        tag-pvid
        pvid 240
        exit

vlan 1  
        member INTA5-INTA14,EXT1-EXT4,EXT6-EXT10
        no member INTA1-INTA4,EXT5
!       
vlan 220
        enable
        name "VLAN 220"
        member EXT1-EXT4
!       
vlan 230
        enable
        name "VLAN 230"
        member EXT1-EXT4
!       
vlan 240
        enable
        name "VLAN 240"
        member INTA1-INTA4,EXT1-EXT5

interface port EXT1
        lacp mode active
        lacp key 10
!       
interface port EXT2
        lacp mode active
        lacp key 10

N2K configuration:

FEX_101

interface port-channel30
  switchport
  switchport mode trunk
  vpc 30

interface port-channel31
  switchport
  switchport mode trunk
  vpc 31

interface Ethernet101/1/1
  description to IBM_Switch_1
  switchport
  switchport mode trunk
  channel-group 30 mode active
  no shutdown

interface Ethernet101/1/2
  description to IBM_Switch_2
  switchport
  switchport mode trunk
  channel-group 31 mode active
  no shutdown

FEX_102

interface port-channel30
  switchport
  switchport mode trunk
  vpc 30

interface port-channel31
  switchport
  switchport mode trunk
  vpc 31

interface Ethernet102/1/1
  description to IBM_Switch_1
  switchport
  switchport mode trunk
  channel-group 30 mode active
  no shutdown

interface Ethernet102/1/2
  description to IBM_Switch_1
  switchport
  switchport mode trunk
  channel-group 31 mode active
  no shutdown

[Frank Walker]

Hi,

some time ago I had performance problems with a CISCO attached to a IBM/BNT G8264 Rack switch (without port-channel and VPC ). I my case I had to change flow control setting on the BNT switch to get good transfer rates. Don't know if this will help you. But have a look at these settings and try to change/match both ends.

BNT Switch #show int status
-----------------------------------------------------------------------
Alias   Port   Speed    Duplex     Flow Ctrl      Link     Description
------- ----   -----   --------  --TX-----RX--   ------   -------------
INTA1    1     10000     full     yes    yes       up        INTA1
INTA2    2     10000     full     yes    yes       up        INTA2

N2K# show int Eth107/1/1 flowcontrol

--------------------------------------------------------------------------------
Port         Send FlowControl  Receive FlowControl  RxPause   TxPause  
             admin    oper     admin    oper
--------------------------------------------------------------------------------
Eth107/1/1   on       on       off      off         0                 0