Etherchannel CISCO 6509 to IBM Blade 3012 Switch

Unanswered Question

Issue bringing up etherchannel aggregate.

Goal:

sw00 8/3-4 --> po1 ---> sw15 0/15-16

**

**509**

!

interface Port-channel1

no ip address

!

<snip>

!

interface GigabitEthernet8/3

shutdown

speed 1000

duplex full

spanning-tree portfast

channel-group 1 mode desirable

channel-protocol pagp

!

interface GigabitEthernet8/4

shutdown

speed 1000

duplex full

spanning-tree portfast

channel-group 1 mode desirable

channel-protocol pagp

!

sw00#sh interfaces etherchannel

----

GigabitEthernet8/3:

Port state = Down Not-in-Bndl

Channel group = 1 Mode = Desirable-Sl Gcchange = 0

Port-channel = null GC = 0x00000000 Pseudo port-channel = Po1

Port index = 0 Load = 0x00 Protocol = PAgP

Flags: S - Device is sending Slow hello. C - Device is in Consistent state.

A - Device is in Auto mode. P - Device learns on physical port.

d - PAgP is down.

Timers: H - Hello timer is running. Q - Quit timer is running.

S - Switching timer is running. I - Interface timer is running.

Local information:

Hello Partner PAgP Learning Group

Port Flags State Timers Interval Count Priority Method Ifindex

Gi8/3 d U1/S1 1s 0 128 Any 0

Age of the port in the current state: 1d:01h:04m:44s

----

GigabitEthernet8/4:

Port state = Down Not-in-Bndl

Channel group = 1 Mode = Desirable-Sl Gcchange = 0

Port-channel = null GC = 0x00000000 Pseudo port-channel = Po1

Port index = 0 Load = 0x00 Protocol = PAgP

Flags: S - Device is sending Slow hello. C - Device is in Consistent state.

A - Device is in Auto mode. P - Device learns on physical port.

d - PAgP is down.

Timers: H - Hello timer is running. Q - Quit timer is running.

S - Switching timer is running. I - Interface timer is running.

Local information:

Hello Partner PAgP Learning Group

Port Flags State Timers Interval Count Priority Method Ifindex

Gi8/4 d U1/S1 1s 0 128 Any 0

Age of the port in the current state: 1d:01h:04m:44s

----

Port-channel1:

Age of the Port-channel = 0d:10h:22m:06s

Logical slot/port = 14/1 Number of ports = 0

GC = 0x00000000 HotStandBy port = null

Passive port list = Gi8/3 Gi8/4

Port state = Port-channel L3-Ag Ag-Not-Inuse

Protocol = PAgP

sw00#

**

**3012**

!

interface Port-channel7

!

<snip>

!

interface GigabitEthernet0/15

switchport mode trunk

shutdown

channel-group 7 mode on

!

interface GigabitEthernet0/16

switchport mode trunk

shutdown

channel-group 7 mode on

!

sw15#sh interfaces etherchannel ?

module Limit display to interfaces on module

| Output modifiers

<cr>

sw15#sh interfaces etherchannel

----

GigabitEthernet0/15:

Port state = Down Not-in-Bndl

Channel group = 7 Mode = On Gcchange = -

Port-channel = null GC = - Pseudo port-channel = Po7

Port index = 0 Load = 0x00 Protocol = -

Age of the port in the current state: 0d:14h:53m:54s

----

GigabitEthernet0/16:

Port state = Down Not-in-Bndl

Channel group = 7 Mode = On Gcchange = -

Port-channel = null GC = - Pseudo port-channel = Po7

Port index = 0 Load = 0x00 Protocol = -

Age of the port in the current state: 0d:14h:53m:54s

----

Port-channel7:

Age of the Port-channel = 0d:09h:56m:40s

Logical slot/port = 10/7 Number of ports = 0

GC = 0x00000000 HotStandBy port = null

Port state = Port-channel Ag-Not-Inuse

Protocol = -

Port security = Disabled

**

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mahmoodmkl Thu, 05/14/2009 - 05:31

Hi

I think u need to use LACP instead of pagp becoz its cisco proprietary.

And i see the ports on the other switch as shutdown,enable them and check.

Thanks

Mahmood

Thanks for reply:

Both switches are CISCO

CISCO 6509

CISCO 3012

***

sw15(config-if-range)#no shut

% Shutdown not allowed on this interface.

% Range command terminated because it failed on GigabitEthernet0/15

sw15(config-if-range)#exit

*****

sw00(config)#int range gi8/3 - 4

sw00(config-if-range)#no shut

sw00(config-if-range)#exit

****

sw00#sh interfaces port-channel 1

Port-channel1 is up, line protocol is down (notconnect)

Hardware is EtherChannel, address is 0013.5f31.530a (bia 0013.5f31.5300)

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

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

****

sw15#sh interfaces port-channel 7

Port-channel7 is down, line protocol is down (notconnect)

Hardware is EtherChannel, address is 0000.0000.0000 (bia 0000.0000.0000)

MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,

mahmoodmkl Thu, 05/14/2009 - 05:55

Hi

Can u try the below config on both the switches.

interface range gig8/3-4

switchport

switchport mode trunk

switchport trunk encap dot1q

channel-group 1 mode desirable

Thanks

Mahmood

glen.grant Thu, 05/14/2009 - 06:17

You are forcing one side on while the other side is trying to negotiate using pagp , make both sides as desirable non-silent .

channel-group x desirable non-silent.

I have had other issues but am coming back to this issue which is still outstanding:

Here is the current state. I have followed the CISCO / IBM redbook on how to do almost the EXACT configuration that i have (http://www.redbooks.ibm.com/abstracts/redp3869.html pages 124-128)

Also CISCO website http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_paper09186a00800c8441.html

****6509****

!

interface Port-channel1

description EtherChannel to sw15 15-16

duplex full

switchport

switchport trunk encapsulation dot1q

switchport trunk native vlan 11

switchport mode trunk

spanning-tree guard root

!

!

interface GigabitEthernet8/3

description sw15-15 (po 1)

duplex full

switchport

switchport trunk native vlan 11

switchport mode trunk

spanning-tree guard root

channel-group 1 mode active

!

interface GigabitEthernet8/4

description sw15-16 (po 1)

duplex full

switchport

switchport trunk native vlan 11

switchport mode trunk

spanning-tree guard root

channel-group 1 mode active

!

sw00#sh etherchannel port-channel

Channel-group listing:

-----------------------

Group: 1

----------

Port-channels in the group:

----------------------

Port-channel: Po1 (Primary Aggregator)

------------

Age of the Port-channel = 0d:01h:19m:50s

Logical slot/port = 14/1 Number of ports = 0

Port state = Port-channel Ag-Not-Inuse

Protocol = LACP

sw00#sh cdp neighbors

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID Local Intrfce Holdtme Capability Platform Port ID

sw15 Gig 8/5 167 S I WS-CBS3012Gig 0/15

sw15 Gig 7/6 167 S I WS-CBS3012Gig 0/18

sw15 Gig 7/5 167 S I WS-CBS3012Gig 0/17

******

****3012****

!

interface Port-channel1

description EtherChannel po1 sw00 8 3-4

switchport trunk native vlan 11

switchport mode trunk

!

!

interface GigabitEthernet0/15

description sw00 8 3-4

switchport trunk native vlan 11

switchport mode trunk

speed 1000

duplex full

channel-group 1 mode active

!

interface GigabitEthernet0/16

description sw00 8 3-4

switchport trunk native vlan 11

switchport mode trunk

speed 1000

duplex full

channel-group 1 mode active

!

sw15#sh etherchannel port-channel

Channel-group listing:

----------------------

Group: 1

----------

Port-channels in the group:

---------------------------

Port-channel: Po1 (Primary Aggregator)

------------

Age of the Port-channel = 0d:01h:12m:18s

Logical slot/port = 10/1 Number of ports = 0

HotStandBy port = null

Port state = Port-channel Ag-Not-Inuse

Protocol = LACP

Port security = Disabled

sw15#sh cdp neighbors

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID Local Intrfce Holdtme Capability Platform Port ID

sw15 Fas 0 152 S I WS-CBS301 Gig 0/19

sw15 Gig 0/19 161 S I WS-CBS301 Fas 0

sw00 Gig 0/18 128 R S I WS-C6509 Gig 7/6

sw00 Gig 0/17 128 R S I WS-C6509 Gig 7/5

sw00 Gig 0/15 128 R S I WS-C6509 Gig 8/5

******

I figured out the error.

I just needed another CISCO guy to sit next to me to point it out ...

Root Cause: Patching cables and documenting 2am :(

If you look closely at CDP neighborhood it shows:

sw00 Gig 0/18 128 R S I WS-C6509 Gig 7/6

sw00 Gig 0/17 128 R S I WS-C6509 Gig 7/5

so the sw15 (3012 blade switch)ports 17 and 18 are plugged into sw00 ports 7/5 and 7/6 NOT the 7/3 and 7/4 that I was expecting.

Lesson learned: CDP = Friend trust it not your helpers patching cables.

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