05-14-2009 05:24 AM - edited 03-06-2019 05:44 AM
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
**
05-14-2009 05:31 AM
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
05-14-2009 05:40 AM
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,
05-14-2009 05:55 AM
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
05-14-2009 06:17 AM
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.
05-28-2009 05:52 AM
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
******
05-28-2009 10:49 AM
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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