We have a 2600 series router using it as an SLT and have SS7 up and running for long time now using Cisco PGW2200.
Recently I started seeing a huge amount of errors both Line Code Violations and Line Path Violations on the SLT causing the SS7 link to constantly go down. Strange enough the SS7 in non-peak hours i.e 1:00 AM to 6:00 AM. I am using VWIC-2MFT-E1-DI.
Knowing that this may be caused by physical layer issues, we have conducted software and hardware loopback tests with the the service provider and all tests succeeded using the service provider analyzers. However when doing a hardware loop from the SP end on the E1 while leaving the E1 terminated on the VWIC, we notice no changed on the interface. It doesn't change to UP and line code violations keep increasing.
IOS upgrade on asr9xx mandates rommon upgrades sometimes while they can be optional at other times. You may land up in unwanted situation if proper procedure is not followed during upgrades.
This article will include complete details about rommon ...
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