4500X VSL issue

[umer zubairi]

Friends, I'm trying to configure VSS on a pair of 16 port 4500X.

However, whilst creating the VSL I'm getting below and Port-channel isn't coming up.

EC-5-CANNOT_BUNDLE2: Te1/1 is not compatible with Po5 and will be suspended (trunk mode of Te1/1 is dynamic, Po5 is trunk)

Please help!

[Francesco Molino]

Hi

It seems you have trunk dynamic configured on Te1/1.
Can you configure it like:
int te1/1
switchport mode trunk

and test it again?

[umer zubairi]

Thanks Bro!!

I even tried that configuring the physical ports as trunks.

Below is my VSL configuration the Warning that I get when applying Port-channel on the Te interfaces

***** Also attached some show outputs of logical and physical interfaces*******

Switch(config)#switch virtual domain 165
Domain ID 165 config will take effect only
after the exec command 'switch convert mode virtual' is issued

Switch(config-vs-domain)#switch 1
Switch(config-vs-domain)#switch 1 priority 200
Switch(config-vs-domain)#exit
!
Switch(config)#int port-channel 39
Switch(config-if)#switchport
Switch(config-if)#switch virtual link 1
WARNING:Port channel number for VSL on both chassis should not be same

Switch(config)#int range te 1/1-2
Switch(config-if-range)#channel-group 39 mode on

WARNING: Interface TenGigabitEthernet1/1 placed in restricted config mode. All extraneous configs removed!
*Jan 28 05:14:15.787: %EC-5-CANNOT_BUNDLE2: Te1/1 is not compatible with Po39 and will be suspended (trunk mode of Te1/1 is dynamic, Po39 is trunk)
WARNING: Interface TenGigabitEthernet1/2 placed in restricted config mode. All extraneous configs removed!
*Jan 28 05:14:16.986: %EC-5-CANNOT_BUNDLE2: Te1/2 is not compatible with Po39 and will be suspended (trunk mode of Te1/2 is dynamic, Po39 is trunk)

[Francesco Molino]

Hi

retry removing all configs :

default interface te1/1

default interface te1/2

no int port-ch 39

!

nterface Port-channel39
description - VSL LINK -
no switchport
no ip address
switch virtual link 1

!

interface range Te1/1 - 2
description - VSL LINK -
no switchport
no ip address
no cdp enable
channel-group 39 mode on

Try that and let me know

[umer zubairi]

Thanks again Francesco for your prompt support.

But don't you think that by configuring  Po39 with no switchport command will create a L3 etherchannel, whereas a L2 port-channel is needed to create the Virtual Switching Links.

[Francesco Molino]

Sorry, I gave you a VSS config for 6k...

On 4k try that:

default interface te1/1

default interface te1/2

no int port-ch 39

!

interface Port-channel39
description - VSL LINK -
switchport
switchport mode trunk
switchport nonegotiate
switch virtual link 1

!

interface range Te1/1 - 2
description - VSL LINK -
switchport mode trunk
switchport nonegotiate
no lldp transmit
no lldp receive
no cdp enable
channel-group 1 mode on

[Deepak Kumar]

I don't know why below commands configured under the interfaces too:

interface range Te1/1 - 2
switchport mode trunk
switchport nonegotiate
no lldp transmit
no lldp receive
no cdp enable

As per port-channel rules, Port-Channel configuration will automatically apply to all members ports. there is no required to configure the ports too.

Regards,
Deepak Kumar

[Francesco Molino]

It's just to be sure interfaces are configured properly. This is not mandatory.
I asked to set interfaces as his issue is coming from misconfiguration.

[umer zubairi]

I even tried resetting all the configs which were automatically added to the interfaces when I created the VSL.

Here is the revised configs but the interfaces stay as suspended member of port-channel :(

*****************

Configuration

*****************

interface Port-channel39
switchport
switchport mode trunk
switchport nonegotiate
switch virtual link 1
!
interface TenGigabitEthernet1/1
switchport mode trunk
switchport nonegotiate
no lldp transmit
no lldp receive
no cdp enable
channel-group 39 mode on
service-policy output VSL-Queuing-Policy
!
interface TenGigabitEthernet1/2
switchport mode trunk
switchport nonegotiate
no lldp transmit
no lldp receive
no cdp enable
channel-group 39 mode on
service-policy output VSL-Queuing-Policy
!

*******************

Sh output

******************

sh int tenGigabitEthernet 1/1 sw
Switch#sh int tenGigabitEthernet 1/1 switchport
Name: Te1/1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down (suspended member of bundle Po39)
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none

[Francesco Molino]

And with that config you still getting the error message?
Can you share the output of sh etherchannel suma

[umer zubairi]

Sure here it is...

Switch#sh etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator

M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port

Number of channel-groups in use: 1
Number of aggregators: 1

Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
39 Po39(SD) - Te1/1(w) Te1/2(w)

[Deepak Kumar]

Can you do one thing for a testing?
Just create a new port-channel with any other number and try again.

Regards,
Deepak Kumar

[umer zubairi]

The other switch that is planned to be paired with this one as VSS is having the same issues with different port-channel which is Po40

Same outputs from that switch as well.

I didn't do any additional configs just a normal way of making the VSS no idea why the VSL isn't coming up :(

Step 1

Switch 1
SW1(config)#switch virtual domain 165
SW1(config-vs-domain)#switch 1
SW1(config-vs-domain)#switch 1 priority 200
SW1(config-vs-domain)#exit
SW1(config)#
Switch 2
SW2(config)#switch virtual domain 165
SW2(config-vs-domain)#switch 2
SW2(config-vs-domain)#exit
SW2(config)#

Step 2
Switch 1
SW1(config)#int port-channel 39
SW1(config-if)#switchport
SW1(config-if)#switch virtual link 1
SW1(config-if)#no shut
SW1(config-if)#exit

Switch 2
SW2(config)#int port-channel 41
SW2(config-if)#switchport
SW2(config-if)#switch virtual link 2
SW2(config-if)#no shut
SW2(config-if)#exit
Step 3
Switch 1
SW2(config)#int range te 1/1-2
SW2(config-if-range)#channel-group 39 mode on
SW2(config-if-range)#exit
!

Switch 2
SW2(config)#int range te 1/1-2
SW2(config-if-range)#channel-group 41 mode on
SW2(config-if-range)#exit
!

Please note that both of my switches are straight out of the box and have no configs at all on them

[Deepak Kumar]

Hi,
Please configure a command on both interfaces as physical and port-channel and check-
"switchport mode dynamic auto"

Regards,
Deepak Kumar

[umer zubairi]

Do you think it's safe to configure VSL as dynamic auto, I mean in case of any link-flapping or VSS split brain switchports might flap to be working as Access Ports. 

In fact, the warning I'm getting doesn't say anything about dtp nonegotiation