IP SLB on 6500 series
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Posted by BernieM on April 18, 2006, 5:45 am
Please log in for more thread options Having trouble with slb. A server keeps cycling from operational to failed and back again ... over and over ... Apr 18 19:22:48: %SLB-6-REAL: Real 172.22.2.125 (VPRDNS) has changed state to FAILED Apr 18 19:22:51: %SLB-6-REAL: Real 172.22.2.125 (VPRDNS) has changed state to OPERATIONAL Apr 18 19:22:56: %SLB-6-REAL: Real 172.22.2.125 (VPRDNS) has changed state to FAILED But the probe never shows any misses: wcq15-core-6513#sh ip slb probe name vprdns detail VPRDNS, dns, address = 0.0.0.0, interval = 15, faildetect = 3 VPRDNS, type = server target = 172.22.247.1:53, real = 172.22.2.125:0, virtual = 172.22.247.1:53 TCP state = OPERATIONAL, status = 1, operation id = 170 Server NAT outages = 0, failures = 0, successes = 208, tests = 0 current = never, cumulative = 00:00:00 target = 172.22.247.1:53, real = 172.22.2.125:0, virtual = 172.22.247.1:53 UDP state = OPERATIONAL, status = 1, operation id = 169 Server NAT outages = 0, failures = 0, successes = 208, tests = 0 current = never, cumulative = 00:00:00 Here's the config: ip slb vserver VPRDNS virtual 172.22.247.1 udp dns serverfarm VPRDNS idle 5 replicate casa 172.22.31.253 172.22.31.252 1029 synguard 200 inservice standby VPRDNS-HSRP ! ip slb serverfarm VPRDNS nat server nat client CLIENTS probe VPRDNS ! real 172.22.2.125 weight 1 inservice ! real 172.22.9.50 weight 1 inservice ! real 172.22.16.207 weight 1 inservice ! ip slb probe VPRDNS dns lookup prproxy.ourdomain.com interval 15 Also, the VIP only forwards UDP but the probe is testing both UDP and TCP. Can I control this? Thanks, BernieM | |||||||||||||
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Posted by BernieM on April 19, 2006, 3:04 am
Please log in for more thread options Forget the question about the probe testing both UDP and TCP. We have another (tcp) vip configured using the same server farm and probe so it's expected. I did discover today though that although the probe shows no misses, "show ip slb real name vprdns detail" does show some 'connection failures' which increment in parallel with the server becoming 'failed'. Ethereal tracing shows all connection attempts successful though. BernieM | |||||||||||||
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>
> Having trouble with slb. A server keeps cycling from operational to
> failed and back again ... over and over ...
>
> Apr 18 19:22:48: %SLB-6-REAL: Real 172.22.2.125 (VPRDNS) has changed state
> to FAILED
> Apr 18 19:22:51: %SLB-6-REAL: Real 172.22.2.125 (VPRDNS) has changed state
> to OPERATIONAL
> Apr 18 19:22:56: %SLB-6-REAL: Real 172.22.2.125 (VPRDNS) has changed state
> to FAILED
>
> But the probe never shows any misses:
>
> wcq15-core-6513#sh ip slb probe name vprdns detail
> VPRDNS, dns, address = 0.0.0.0, interval = 15, faildetect = 3
> VPRDNS, type = server
> target = 172.22.247.1:53, real = 172.22.2.125:0, virtual =
> 172.22.247.1:53 TCP
> state = OPERATIONAL, status = 1, operation id = 170 Server NAT
> outages = 0, failures = 0, successes = 208, tests = 0
> current = never, cumulative = 00:00:00
> target = 172.22.247.1:53, real = 172.22.2.125:0, virtual =
> 172.22.247.1:53 UDP
> state = OPERATIONAL, status = 1, operation id = 169 Server NAT
> outages = 0, failures = 0, successes = 208, tests = 0
> current = never, cumulative = 00:00:00
>
>
> Here's the config:
>
> ip slb vserver VPRDNS
> virtual 172.22.247.1 udp dns
> serverfarm VPRDNS
> idle 5
> replicate casa 172.22.31.253 172.22.31.252 1029
> synguard 200
> inservice standby VPRDNS-HSRP
> !
> ip slb serverfarm VPRDNS
> nat server
> nat client CLIENTS
> probe VPRDNS
> !
> real 172.22.2.125
> weight 1
> inservice
> !
> real 172.22.9.50
> weight 1
> inservice
> !
> real 172.22.16.207
> weight 1
> inservice
> !
> ip slb probe VPRDNS dns
> lookup prproxy.ourdomain.com
> interval 15
>
>
> Also, the VIP only forwards UDP but the probe is testing both UDP and TCP.
> Can I control this?
>
> Thanks,
>
> BernieM
>