Hi all,
I am configuring 2 1760 connected back-to-back using a single T1. In order to support VoIP, I want to enable PPP multilink on the T1 for fragmentation. However when I enable PPP multilink on the T1 serial interface, the link goes down and the serial interface reports framing errors and resets. If I do not enable multilink the link is clean.
I searched the documentation and I cannot find anywhere that this setup is not supported. I am running the same setup between 2811 without errors.
Is there something I am missing?
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname pvgtwy4a
!
boot-start-marker
boot-end-marker
!
!
tdm clock T1 0/0 data import onboard internal
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
no aaa new-model
ip subnet-zero
ip cef
!
!
!
!
no ftp-server write-enable
!
!
!
!
!
!
!
!
!
!
!
!
!
!
controller T1 0/0
framing esf
linecode b8zs
cablelength short 133
channel-group 0 timeslots 1-24 speed 64
!
!
!
interface Multilink1
mtu 2000
ip address 10.255.255.2 255.255.255.252
max-reserved-bandwidth 100
ip route-cache flow
ip tcp header-compression iphc-format
ppp multilink
ppp multilink fragment delay 5
ppp multilink interleave
ppp multilink group 1
ppp multilink mrru local 2000
ppp multilink mrru remote 2000
ip rtp header-compression iphc-format
!
interface FastEthernet0/0
ip address 192.168.1.1 255.255.255.0
speed auto
full-duplex
!
interface Serial0/0:0
ip address 10.255.255.6 255.255.255.252
max-reserved-bandwidth 100
encapsulation ppp
ppp multilink
ppp multilink group 1
!
ip classless
!
no ip http server
!
!
control-plan
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname pvgtwy4b
!
boot-start-marker
boot-end-marker
!
tdm clock T1 0/0 both export line
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
voice-card 0
!
no aaa new-model
ip subnet-zero
ip cef
!
!
!
!
no ftp-server write-enable
!
!
!
!
!
!
!
!
!
!
!
!
!
!
controller T1 0/0
framing esf
linecode b8zs
cablelength short 133
channel-group 0 timeslots 1-24 speed 64
!
!
!
interface Multilink1
mtu 2000
ip address 10.255.255.1 255.255.255.252
max-reserved-bandwidth 100
ip route-cache flow
ip tcp header-compression iphc-format
ppp multilink
ppp multilink fragment delay 5
ppp multilink interleave
ppp multilink group 1
ppp multilink mrru local 2000
ppp multilink mrru remote 2000
ip rtp header-compression iphc-format
!
interface FastEthernet0/0
ip address 192.168.0.1 255.255.255.0
speed auto
full-duplex
!
interface Serial0/0:0
ip address 10.255.255.5 255.255.255.252
max-reserved-bandwidth 100
encapsulation ppp
ppp multilink
ppp multilink group 1
!
ip classless
!
no ip http server
!
!
control-plane
