We have 3 AS5400 HPX and 1 AS5400 XM. These devices are used as voice Media Gateway and connected to an SDH transport network via 8 port E1 DFC card.
Links fluctuate continuously whenever there is a switching on SDH backbone. Ideally the router should never see the SDH switching because the switching time would be very small, less than 50ms and it verified with specific instrumentation:
During SDH switching, the router E1 controller goes down for 1 second and the voice calls are dropped. The router shows always 5 SES but only 1 SES happens:
During SDH switching, the ADM sends a very fast AIS alarm for about 100 ms but it is normal in this situation.
This is the E1 controller configuration:
controller E1 7/0
channel-group 15 timeslots 16
ds0-group 0 timeslots 1-15,17-31 type none service mgcp
0 Line Code Violations, 0 Path Code Violations,
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
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loadbalancing is one of the more complex items in hardware forwarding. of course we have talked about it many years on cisco live (id 2904) with ever incrementing more detail. and there is the support forum article on loadbalancing.
IntroductionArchitecture Building BlocksIOS-XR RoutersConfigurationPerformance VerificationOptimizationStrict timerSome more verificationThe CollectorInfluxDBDatabase statistics and HealthClosing comments
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