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snmp trap on an isdn pri interface



i have an isdn pri interface, which should NOT generate any trap if it goes up or down - this is the config:

interface Serial3/0:15

no ip address

encapsulation ppp

load-interval 30

timeout absolute 600 0

dialer pool-member 215

no snmp trap link-status

isdn switch-type primary-net5

no cdp enable

ppp authentication chap

ppp multilink

max-reserved-bandwidth 95


interface Dialer215

bandwidth 2048

ip address

encapsulation ppp

ip ospf cost 1000

load-interval 30

dialer pool 215

dialer remote-name mplsrbgope02

dialer string 123

dialer max-call 30

dialer watch-group 1

dialer-group 1

no snmp trap link-status

tag-switching mtu 1512

tag-switching ip

no cdp enable

ppp authentication chap callin

ppp chap hostname r-traun1

ppp multilink


If i make a call to this interface (with my mobile or so), the router gnerates an snmp trap - so we get an info in our management - thats bad -

here is the snmp- debug:

r-traun1#debug snmp pa

SNMP packet debugging is on


Nov 9 10:11:03.235: SNMP: Queuing packet to

Nov 9 10:11:03.235: SNMP: V1 Trap, ent ciscoIsdnMibTrapPrefix, addr, gentrap 6, spectrap 2

demandNbrLogIf.50.7 = 51

demandNbrAddress.50.7 = 67681411297

demandNbrLastDuration.50.7 = 0

demandNbrClearReason.50.7 = Incompatible destination

demandNbrClearCode.50.7 = 0x58

demandNbrCallOrigin.50.7 = 2

Nov 9 10:11:03.487: SNMP: Packet sent via UDP to

Nov 9 10:11:04.051: SNMP: Packet received via UDP from on FastEthernet0/0.413

Nov 9 10:11:04.051: SNMP: Get request, reqid 5027855, errstat 0, erridx 0

ifEntry.1.14 = NULL TYPE/VALUE

ifEntry.8.14 = NULL TYPE/VALUE

ifEntry.7.14 = NULL TYPE/VALUE

Nov 9 10:11:04.059: SNMP: Response, reqid 5027855, errstat 0, erridx 0

ifEntry.1.14 = 14

ifEntry.8.14 = 1

ifEntry.7.14 = 1

Nov 9 10:11:04.067: SNMP: Packet sent via UDP to

r-traun1#un all

All possible debugging has been turned off


i also tried the command "no snmp trap isdn-calls" - but no success

any idea????

thanks for any answer

2 Replies 2


The trap that is generated is not a link-state change trap. What snmp traps are enabled in the global snmp config?




thanks for answer - here are the global snmp config commands:

r-traun1#sh run | in snmp

no snmp trap link-status

no snmp trap link-status

no snmp trap link-status

no snmp trap link-status

no snmp trap link-status

no snmp trap link-status

no snmp trap link-status

no snmp trap link-status

snmp-server community xx RO 99

snmp-server community xx RW 99

snmp-server ifindex persist

snmp-server trap-source Loopback0

snmp-server location xx

snmp-server contact xx

snmp-server chassis-id S/N: 123

snmp-server system-shutdown

snmp-server enable traps snmp authentication linkdown linkup coldstart warmstart

snmp-server enable traps tty

snmp-server enable traps isdn call-information

snmp-server enable traps isdn layer2

snmp-server enable traps isdn chan-not-avail

snmp-server enable traps isdn ietf

snmp-server enable traps hsrp

snmp-server enable traps config

snmp-server enable traps entity

snmp-server enable traps frame-relay

snmp-server enable traps frame-relay subif

snmp-server enable traps syslog

snmp-server enable traps rtr

snmp-server host public

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