IP SLB on 6500 series

Discussion in 'Cisco' started by BernieM, Apr 18, 2006.

  1. BernieM

    BernieM Guest

    Hello all,

    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
     
    BernieM, Apr 18, 2006
    #1
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  2. BernieM

    BernieM Guest

    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
     
    BernieM, Apr 19, 2006
    #2
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