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Suppression of SNMP trap alerts for B channels for ISDN link

Hello Monitoring Guru's,

We have a network monitoring requirement to just monitor the D channel for isdn link. We are already polling to monitor the status of D channel for up and down. The problem  is we have disabled link status traps for the E1 card by putting no snmp trap link status statemnt on the E1 card as well as on the D channel but still we get SNMP link status traps for the B channels whenever the router gets rebooted (I am not really sure if it is a bug). I really dont want to disable SNMP link status traps globally as I still want traps for the other ethernet interfaces on the router.  Is there a way to disable traps for the B channels or is there a workaround to resolve this?

Can someone please assist me?