Hi,
We had a cut over to migrate from Cisco 2901 to ISR 4321 but it was unsuccessful, the primary usage of the device is for ISDN connectivity and we just use it for data communication(No voice).
Chassis: ISR4321/K9
Module : : NIM-4BRI-S/T
Version: 16.08.01
During the migration, ISDN physical interfaces came up but traffic is not getting through, we verified it by sending some interesting traffic through it. When we switch the connections to 2901 then it starts working.
Working with Cisco TAC from a long time but it's not going anywhere and I am kind of blocked.
Not able to isolate whether the issue is with ISR 4321(config issue) or with the provider but since connectivity is fine with the 2901 I am assuming it may be an issue with ISR 4321 but don't have any data.
Not seeing anything on ISDN debugs on the box.
Does anyone have first hand experience migrating from 2901to ISR 4321?
Appreciate any help here.
Configs:
=====
interface GigabitEthernet0/0/1
description "towards internal network"
ip address <>
ip nat inside
standby 10 ip <>
standby 10 timers 2 6
standby 10 priority 200
standby 10 preempt
negotiation auto
!
interface Dialer1
ip address negotiated
ip nat outside
encapsulation ppp
dialer in-band
dialer idle-timeout 30
dialer map ip <> class dial1<>
dialer-group 1
no cdp enable
ppp authentication chap callin
ppp chap hostname <>
ppp chap password 7 <>
ip virtual-reassembly
!
interface Dialer2
ip address negotiated
ip nat outside
encapsulation ppp
dialer in-band
dialer idle-timeout 30
dialer map ip <> name sq-2 class dial1<>
dialer-group 2
no cdp enable
ppp callback request
ppp ipcp address accept
ip virtual-reassembly
!
interface Dialer3
ip address negotiated
encapsulation ppp
dialer in-band
dialer map ip <> class dial3 <>
dialer map ip <> class dial3 <>
dialer-group 3
no cdp enable
ppp authentication chap callin
ppp chap hostname <>
ppp chap password 7 <>
ip virtual-reassembly
!
interface BRI0/2/0:0
ip address negotiated
ip nat outside
encapsulation ppp
dialer rotary-group 1
dialer-group 1
no cdp enable
isdn switch-type ntt
isdn point-to-point-setup
ppp ipcp address accept
ip virtual-reassembly
!
interface BRI0/2/1:0
ip address negotiated
ip nat outside
encapsulation ppp
dialer rotary-group 2
dialer-group 2
no cdp enable
isdn switch-type ntt
isdn point-to-point-setup
ppp ipcp address accept
ip virtual-reassembly
!
interface BRI0/2/2:0
ip address negotiated
ip nat outside
encapsulation ppp
dialer rotary-group 2
dialer-group 2
no cdp enable
isdn switch-type ntt
isdn point-to-point-setup
ppp ipcp address accept
ip virtual-reassembly
!
mr01.nrt1#show isdn status
Global ISDN Switchtype = ntt
ISDN BRI0/2/0:0 interface
dsl 4, interface ISDN Switchtype = ntt
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 73, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 4 CCBs = 0
The Free Channel Mask: 0x80000003
ISDN BRI0/2/1:0 interface
dsl 5, interface ISDN Switchtype = ntt
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 71, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 5 CCBs = 0
The Free Channel Mask: 0x80000003
ISDN BRI0/2/2:0 interface
dsl 6, interface ISDN Switchtype = ntt
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 71, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 6 CCBs = 0
The Free Channel Mask: 0x80000003
ISDN BRI0/2/3:0 interface
dsl 7, interface ISDN Switchtype = ntt
Layer 1 Status:
SHUTDOWN
Layer 2 Status:
Layer 2 NOT Activated
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 7 CCBs = 0
The Free Channel Mask: 0x00000000
Total Allocated ISDN CCBs = 0
NOTE: Same configuration works on 2901. DIdn't paste the entire config and masked some data.
