C6880X and 6800IA reboots when VSL link is broken

[liewtienqing]

Hi All,

Met with a strange behaviour today,

we have 2x C6880X and IAs etherchanneled to either core.

When the VSL is unplugged, the core and IAs will reboot and fail to restore connection.

VSS is on (show switch virtual link)

Could really use some help here, thanks a lot!

[balaji.bandi]

Depends how you have configuered, explain more how the setup and topology and show run config of both the devices.

[liewtienqing]

The setup is normal:

Two 6880 with 2x physical links in 2 portchannels

IAs are connected with 2x physical links (portchannel), one link each to each 6880

UPDATE:

I noticed that Fast Hello is enabled but I do not have a third physical link for it.

So is it normal behaviour for the Cores and IAs to reload when VSL breaks in this case?

I did read about the split brain scenario

Related VSS show run:

boot system bootdisk:c6880x-ipservicesk9-mz.SPA.151-2.SY6.bin

fex 112
description FEX0112
fex 113
description FEX0113
fex 144
description FEX0144
fex 152
description FEX0152
fex 153
description FEX0153
fex 163
description FEX0163
fex 170
description FEX0170
fex 174
description FEX0174
fex 182
description FEX0182
fex 192
description FEX0192
fex 194
description FEX0194
fex 195
description FEX0195
fex 196
description FEX0196
!
switch virtual domain 1
switch mode virtual
switch 1 priority 200
mac-address use-virtual

redundancy
main-cpu
auto-sync running-config
mode sso

interface Port-channel1
no switchport
no ip address
no platform qos channel-consistency
switch virtual link 1

interface TenGigabitEthernet1/5/7
no switchport
no ip address
no cdp enable
channel-group 1 mode on
!
interface TenGigabitEthernet1/5/8
no switchport
no ip address
no cdp enable
channel-group 1 mode on

interface Port-channel2
no switchport
no ip address
no platform qos channel-consistency
switch virtual link 2

interface TenGigabitEthernet2/5/7
no switchport
no ip address
no cdp enable
channel-group 2 mode on
!
interface TenGigabitEthernet2/5/8
no switchport
no ip address
no cdp enable
channel-group 2 mode on

sh switch virtual dual sum
Pagp dual-active detection enabled: Yes
Fast-hello dual-active detection enabled: Yes
FEX dual-active detection enabled: Yes

No interfaces excluded from shutdown in recovery mode

In dual-active recovery mode: No

sh switch virtual
Switch mode : Virtual Switch
Virtual switch domain number : 1
Local switch number : 1
Local switch operational role: Virtual Switch Active
Peer switch number : 2
Peer switch operational role : Virtual Switch Standby
C6880X-SSV-D7WC4#sh switch virtual link
VSL Status : UP
VSL Uptime : 14 hours, 36 minutes
VSL SCP Ping : Pass
VSL ICC Ping : Pass
VSL Control Link : Te1/5/7
VSL Encryption : Configured Mode - Off, Operational Mode - Off

sh switch virtual role
RRP information for Instance 1

--------------------------------------------------------------------
Valid Flags Peer Preferred Reserved
Count Peer Peer

--------------------------------------------------------------------
TRUE V 1 1 1

Switch Switch Status Priority Role Local Remote
Number Oper(Conf) SID SID
--------------------------------------------------------------------
LOCAL 1 UP 200(200) ACTIVE 0 0
REMOTE 2 UP 100(100) STANDBY 8204 7706

Peer 0 represents the local switch

Flags : V - Valid

In dual-active recovery mode: No

[Georg Pauwen]

Hello,

does a 'normal' failover work (redundancy force-switchover) ?

[liewtienqing]

I'll try it during another downtime, thanks for suggesting!