Slow stateful failover for mission critical applications

[mcristobal]

I have two CSS running vip redundancy,ip interface redundancy and redundant-index on a ASR active-backup model.

They are attached to separate 3750 which share vlan info via a port channel.

When the master fails, we see the VRIR negotiation and mastership of VIPs occurs normally but the script that we run to validate our services fails and the services go to a down state.

Since the gateway for the reals is a redundant VIP that stays alive always based on a DUMMY service, we believe this could be a mac address table update on the 3750.

Traffic back from the reals is still sent to the "old" port where the gateway used to live.

Failover takes several minutes and TCP sessions timeout defeting stateful failover.

Any ideas???

Thanks

MANUEL

[seilsz]

Manuel,

Are you using the CSSes in a bridged or routed configuration? Is it possible your delay is being caused by STP convergence?

~Zach

[mcristobal]

Bridge configuration.

here is part of the config....

bridge priority 1700

udp-ip-fragment enabled

tcp-ip-fragment enabled

bridge aging-time 10

arp timeout 60

arp wait 10

bridge spanning-tree disabled

[seilsz]

Are there any switch ports connected to either CSS that are in a STP Blocking state?

~Zach

[mcristobal]

VLAN1 STP State: Disabled

VLAN1: Root Max Age: 6 Root Hello Time: 1 Root Fwd Delay: 4

Designated Root: 06-a4-00-11-93-90-61-78

Bridge ID: 06-a4-00-11-93-90-61-78

Root Port Desg

Port State Designated Bridge Designated Root Cost Cost Port

---- ----- ----------------------- ----------------------- ---- ---- ----

VLAN11 STP State: Disabled

VLAN11: Root Max Age: 6 Root Hello Time: 1 Root Fwd Delay: 4

Designated Root: 06-a4-00-11-93-90-61-79

Bridge ID: 06-a4-00-11-93-90-61-79

Root Port Desg

Port State Designated Bridge Designated Root Cost Cost Port

---- ----- ----------------------- ----------------------- ---- ---- ----

e1 Fwd 06-a4-00-11-93-90-61-79 06-a4-00-11-93-90-61-79 0 19 8001

VLAN211 STP State: Disabled

VLAN211: Root Max Age: 6 Root Hello Time: 1 Root Fwd Delay: 4

Designated Root: 06-a4-00-11-93-90-61-7a

Bridge ID: 06-a4-00-11-93-90-61-7a

Root Port Desg

Port State Designated Bridge Designated Root Cost Cost Port

---- ----- ----------------------- ----------------------- ---- ---- ----

VLAN222 STP State: Disabled

VLAN222: Root Max Age: 6 Root Hello Time: 1 Root Fwd Delay: 4

Designated Root: 06-a4-00-11-93-90-61-7b

Bridge ID: 06-a4-00-11-93-90-61-7b

Root Port Desg

Port State Designated Bridge Designated Root Cost Cost Port

---- ----- ----------------------- ----------------------- ---- ---- ----

e3 Fwd 06-a4-00-11-93-90-61-7b 06-a4-00-11-93-90-61-7b 0 19 8003

[seilsz]

I was referring to the switch ports on the 3750's.

~Zach