Failover times for stackwise virtual setup on 9500-16X

[perjoergensen]

Hi all

I have a stackwise virtual setup based on 2 X 9500-16X switches, this stackwise cluster have uplink to the backbone on a LACP port-Channel connected on te1/0/8 and te2/0/8, to one single unit in the backbone, the LACP is Layer2, and I have then configured BGP on a SVI interface between stackwise cluster and backbone unit. All this works as expected, but if i simulate a power outage on the active switch in this stackwise cluster, i looses connection to this stackwise cluster for about a minute or so ( 80-90 ping drops ) , and then all connection are restored to the new active switch in the stackwise cluster. is that how i should expect this stackwise cluster to behave or ?

if i just simulate a link failure , by doing a "shutdown" on the line, between that active switch and the backbone unit, the failover happens immediately ( 1 ping lost ) 

br

PerJ

[balaji.bandi]

how is your config, is the SVL configured SSO/NSF ?

is your BGP configured with bgp graceful-restart ?

if possible can you post the show run config to understand the issue also logs on the failure scenario

[perjoergensen]

Hi Balaji 

Thanks for prompt reply, here is the relevant parts for the configuration

interface TenGigabitEthernet1/0/8
description UPLINK
switchport trunk allowed vlan 4060
switchport mode trunk
channel-group 4 mode active
spanning-tree portfast trunk
end
!
interface TenGigabitEthernet2/0/8
description UPLINK
switchport trunk allowed vlan 4060
switchport mode trunk
channel-group 4 mode active
spanning-tree portfast trunk
end
!
interface Port-channel4
description BGP-TO-BACKBONE
switchport trunk allowed vlan 4060
switchport mode trunk
spanning-tree portfast trunk
end
!
interface Vlan4060
description BGP Link
ip address 10.0.0.18 255.255.255.252
end
!
!
router bgp XXXX
!
bgp router-id XX.XX.XX.228
bgp log-neighbor-changes
neighbor 10.0.0.17 remote-as XXXX
neighbor 10.0.0.17 description BACKBONE
neighbor 10.0.0.17 update-source Vlan4060
!
address-family ipv4
redistribute connected
neighbor 10.0.0.17 activate
neighbor 10.0.0.17 next-hop-self
neighbor 10.0.0.17 soft-reconfiguration inbound
exit-address-family
!
redundancy
mode sso
!
vlan 4060
name XXXXXX

!!

show redundancy
Redundant System Information :
------------------------------
Available system uptime = 2 hours, 26 minutes
Switchovers system experienced = 4
Standby failures = 0
Last switchover reason = active unit removed

Hardware Mode = Duplex
Configured Redundancy Mode = sso
Operating Redundancy Mode = sso
Maintenance Mode = Disabled
Communications = Up

Current Processor Information :
-------------------------------
Active Location = slot 1
Current Software state = ACTIVE
Uptime in current state = 1 hour, 40 minutes
Image Version = Cisco IOS Software [Fuji], Catalyst L3 Switch Software (CAT9K_IOSXE), Version 16.9.5, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2020 by Cisco Systems, Inc.
Compiled Thu 30-Jan-20 18:53 by mcpre
BOOT = flash:packages.conf
CONFIG_FILE =
Configuration register = 0x102

Peer Processor Information :
----------------------------
Standby Location = slot 2
Current Software state = STANDBY HOT
Uptime in current state = 1 hour, 34 minutes
Image Version = Cisco IOS Software [Fuji], Catalyst L3 Switch Software (CAT9K_IOSXE), Version 16.9.5, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2020 by Cisco Systems, Inc.
Compiled Thu 30-Jan-20 18:53 by mcpre
BOOT = flash:packages.conf
CONFIG_FILE =
Configuration register = 0x102

show switch
Switch/Stack Mac Address : 643a.ead7.b100 - Local Mac Address
Mac persistency wait time: Indefinite
H/W Current
Switch# Role Mac Address Priority Version State
-------------------------------------------------------------------------------------
*1 Active 643a.ead7.b100 10 V01 Ready
2 Standby 643a.eaf1.6d80 5 V01 Ready

show stackwise-virtual
Stackwise Virtual Configuration:
--------------------------------
Stackwise Virtual : Enabled
Domain Number : 1

Switch Stackwise Virtual Link Ports
------ ---------------------- ------
1 1 TenGigabitEthernet1/0/15
TenGigabitEthernet1/0/16
2 1 TenGigabitEthernet2/0/15
TenGigabitEthernet2/0/16

[yeshudas-kuriakose]

Hello..were you able to resolve this issue?

[balaji.bandi]

that discussion quite old and there are lot changes may took place on the new code. depends on what code you using.

check one of the good presentation help how that failover take place using NSF :

https://www.ciscolive.com/c/dam/r/ciscolive/emea/docs/2023/pdf/BRKENS-2095.pdf

[shambhu.kumar]

NSF configuration is required for graceful recovery during switch over conditions
Can you try with bgp graceful-restart .