GSLB Unable to synchronize Network MEP (LDNS RTT Entries) in one direction
Article ID: CTX206411
Updated On:
Description
- Netscaler configured for GSLB with RTT as one of the GSLB methods
- Network Metric Exchange is enabled on all GSLB Sites
- show gslb ldnsentries on one Netscaler A shows valid RTT time entries for itself:
S-00 NETSCALER_A_SITE
S-01 NETSCALER_B_SITE
IP MON TTL : S-00 : S-01 :
sec :RTT ms:RTT ms:
10.0.0.1 PING 173 : 2 : 90 :
10.10.10.10 TCP 125 : 24 : 5 :
- show gslb ldnsentries on Netscaler B shows RTT time entries for Netscaler A as T-Out
S-00 NETSCALER_B_SITE
S-01 NETSCALER_A_SITE
IP MON TTL : S-00 : S-01 :
sec :RTT ms:RTT ms:
10.0.0.1 PING 173 : 2 : T-out:
10.10.10.10 TCP 125 : 24 : T-out:
- show gslb site on Netscaler B shows Netscaler A's status as:
Metric exchange: ENABLED Site Metric MEP Status: ACTIVE Public IP: 10.0.0.5
Network metric exchange: ENABLED Persistence session exchange: ENABLED
Network Metric/persistence MEP status: DOWN
- Network traces show no Network Metric Update traffic originating from NETSCALER_A
- RPCNode passwords are verified to be in sync between the two sites
- The following counter is incrementing: gslb_tot_rpc_connect_failed
- A Service exists on NETSCALER_A that is on the NETSCALER_A Site IP on port 3011 or 3009 (MEP ports):
add service BAD_SVC 10.0.0.5 TCP 3011 -gslb NONE -maxClient 0 -maxReq 0 -cip DISABLED -usip NO -useproxyport YES -sp OFF -cltTimeout 9000 -svrTimeout 9000 -CustomServerID "\"None\"" -CKA NO -TCPB NO -CMP NO
Resolution
Remove the service who's IP conflicts with the Site IP on port 3011 or 3009
You will see following counter increment in the logs:
'gslb_err_conflicting_s_info'
Problem Cause
Service conflicting with the Site IP / MEP TCP Ports (3009/3011) causing MEP communication failure.You will see following counter increment in the logs:
'gslb_err_conflicting_s_info'
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