Hi,
And check out: sh etherchannel summary
prakash patel wrote:
check out if gig link is active to STP!!!!
------------------------------------------------------------------------
Date: Wed, 3 Jun 2009 07:50:38 -0700
From: [email protected]
To: [email protected]
Subject: [OSL | CCIE_RS] IPE vol2 lab 3
Guys, I am having some etherchannel woes. I have the following
configuration and have just rebooted the switches to see if that would
help. The task is configure L2 etherchannel group on all switches for
ports 19-24. So 19-20, 21-22, 23-24 channel-groups 1-3 respectively. I
keep seeing spanning tree block when I had thought I would not see
this if etherchannel is working correctly. I have configured and
re-configured. I verified my configuration and re-booted out of
frustration. Can you take a look and see if anything is obvious to you?
port configs on all switches:
interface FastEthernet0/19
switchport trunk encapsulation isl
switchport mode trunk
channel-group 1 mode on
!
interface FastEthernet0/20
switchport trunk encapsulation isl
switchport mode trunk
channel-group 1 mode on
!
interface FastEthernet0/21
switchport trunk encapsulation isl
switchport mode trunk
channel-group 2 mode on
!
interface FastEthernet0/22
switchport trunk encapsulation isl
switchport mode trunk
channel-group 2 mode on
!
interface FastEthernet0/23
switchport trunk encapsulation isl
switchport mode trunk
channel-group 3 mode on
!
interface FastEthernet0/24
switchport trunk encapsulation isl
switchport mode trunk
channel-group 3 mode on
for example on cat 1
Fa0/19 connected trunk a-full a-100
10/100BaseTX
Fa0/20 connected trunk a-full a-100
10/100BaseTX
Fa0/21 connected trunk a-full a-100
10/100BaseTX
Port Name Status Vlan Duplex Speed Type
Fa0/22 connected trunk a-full a-100
10/100BaseTX
Fa0/23 connected trunk a-full a-100
10/100BaseTX
Fa0/24 connected trunk a-full a-100
10/100BaseTX
Gi0/1 disabled 1 auto auto
1000BaseSX SFP
Gi0/2 disabled 1 auto auto
1000BaseSX SFP
Po1 connected trunk a-full a-100
Po2 connected trunk a-full a-100
Po3 connected trunk a-full a-100
Cat1#sh spann block
Name Blocked Interfaces List
-------------------- ------------------------------------
VLAN0010 Po2
VLAN0020 Po2
VLAN0030 Po2
VLAN0040 Po2
VLAN0050 Po2
VLAN0060 Po2
Number of blocked ports (segments) in the system : 6
cat 2
Fa0/19 connected trunk a-full a-100
10/100BaseTX
Fa0/20 connected trunk a-full a-100
10/100BaseTX
Fa0/21 connected trunk a-full a-100
10/100BaseTX
Port Name Status Vlan Duplex Speed Type
Fa0/22 connected trunk a-full a-100
10/100BaseTX
Fa0/23 connected trunk a-full a-100
10/100BaseTX
Fa0/24 connected trunk a-full a-100
10/100BaseTX
Gi0/1 disabled 1 auto auto
1000BaseSX SFP
Gi0/2 disabled 1 auto auto Not
Present
Po1 connected trunk a-full a-100
Po2 connected trunk a-full a-100
Po3 connected trunk a-full a-100
Cat2#sh spann bloc
Name Blocked Interfaces List
-------------------- ------------------------------------
VLAN0001 Po2, Po3
Number of blocked ports (segments) in the system : 2
cat 3
Fa0/19 connected trunk a-full a-100
10/100BaseTX
Fa0/20 connected trunk a-full a-100
10/100BaseTX
Fa0/21 connected trunk a-full a-100
10/100BaseTX
Port Name Status Vlan Duplex Speed Type
Fa0/22 connected trunk a-full a-100
10/100BaseTX
Fa0/23 connected trunk a-full a-100
10/100BaseTX
Fa0/24 connected trunk a-full a-100
10/100BaseTX
Gi0/1 disabled 1 auto auto Not
Present
Gi0/2 disabled 1 auto auto Not
Present
Po1 connected trunk a-full a-100
Po2 connected trunk a-full a-100
Po3 connected trunk a-full a-100
Cat3#sh spann blo
Name Blocked Interfaces List
-------------------- ------------------------------------
Number of blocked ports (segments) in the system : 0
cat 4
Fa0/19 connected trunk a-full a-100
10/100BaseTX
Fa0/20 connected trunk a-full a-100
10/100BaseTX
Fa0/21 connected trunk a-full a-100
10/100BaseTX
Port Name Status Vlan Duplex Speed Type
Fa0/22 connected trunk a-full a-100
10/100BaseTX
Fa0/23 connected trunk a-full a-100
10/100BaseTX
Fa0/24 connected trunk a-full a-100
10/100BaseTX
Gi0/1 disabled 1 auto auto Not
Present
Gi0/2 disabled 1 auto auto Not
Present
Po1 connected trunk a-full a-100
Po2 connected trunk a-full a-100
Po3 connected trunk a-full a-100
Cat4#sh spann block
Name Blocked Interfaces List
-------------------- ------------------------------------
VLAN0001 Po1
VLAN0010 Po1, Po3
VLAN0020 Po1, Po3
VLAN0030 Po1, Po3
VLAN0040 Po1, Po3
VLAN0050 Po1, Po3
VLAN0060 Po1, Po3
Number of blocked ports (segments) in the system : 13
Didn't think spanning-tree would ever affect etherchannel like this,
at least from a blocking sense. I have done other configs where stp
put the port in err-disabled, but none of my ports are errored out as
you can see..
thx guys.
Rob Routt
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