I have only seen this problem with several video conferences from one location. Currently there is only one T1 connection from our HQ to remote location. When two conference calls are set to use 256Kbps connection to come back to the main HQ, after an hour or so the T1 connection would drop. What I mean about drop is that the route on the 2911 will disappear. I have to wait about 10 minutes for the connection to come back up or I have to reboot the router for the connection to appear again. There are no interface drops on the serial connections or ethernet connections.
HQ - 2911
Remote - 1821
2911 running config:
Current configuration : 3529 bytes
!
version 15.0
service timestamps debug datetime msec
service timestamps log datetime msec localtime show-timezone year
service password-encryption
!
hostname
!
boot-start-marker
boot-end-marker
!
card type t1 0 0
card type t1 0 1
card type t1 0 2
!
no aaa new-model
clock timezone gmt -5
clock summer-time cdt recurring
no network-clock-participate wic 0
no network-clock-participate wic 1
no network-clock-participate wic 2
!
no ipv6 cef
ip source-route
ip cef
!
!
!
!
multilink bundle-name authenticated
!
!
!
!
license udi pid CISCO2911/K9 sn FTX1513ALLS
!
!
!
!
controller T1 0/0/0
cablelength long 0db
channel-group 0 timeslots 1-24
!
controller T1 0/0/1
clock source internal
cablelength long 0db
channel-group 0 timeslots 1-24
!
controller T1 0/1/0
clock source internal
cablelength long 0db
channel-group 3 timeslots 1-24
!
controller T1 0/1/1
clock source internal
cablelength long 0db
channel-group 2 timeslots 1-24
!
controller T1 0/2/0
cablelength long 0db
channel-group 0 timeslots 1-24
!
controller T1 0/2/1
clock source internal
cablelength long 0db
channel-group 0 timeslots 1-24
!
buffers middle permanent 200
buffers middle max-free 230
buffers middle min-free 50
buffers big permanent 75
buffers big max-free 200
buffers big min-free 15
buffers verybig permanent 20
buffers verybig max-free 20
buffers tune automatic
!
!
!
!
interface Multilink1
ip address 192.168.200.1 255.255.255.252
ip flow ingress
ip flow egress
load-interval 30
ppp multilink
ppp multilink group 1
ppp multilink fragment disable
no cdp enable
hold-queue 4000 out
!
interface GigabitEthernet0/0
ip address 10.10.3.1 255.255.240.0
ip flow ingress
ip flow egress
duplex full
speed auto
no cdp enable
hold-queue 3000 in
hold-queue 4096 out
!
interface GigabitEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface GigabitEthernet0/2
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0/0:0
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
no fair-queue
hold-queue 40 out
!
interface Serial0/0/1:0
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
no fair-queue
hold-queue 40 out
!
interface Serial0/1/0:3
ip address 192.168.1.2 255.255.255.0
ip flow ingress
ip flow egress
load-interval 60
no fair-queue
hold-queue 200 in
hold-queue 4000 out
!
interface Serial0/1/1:2
ip address 192.168.8.2 255.255.255.0
ip flow ingress
ip flow egress
load-interval 30
no fair-queue
hold-queue 200 in
hold-queue 4096 out
!
interface Serial0/2/0:0
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
no fair-queue
!
interface Serial0/2/1:0
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
no fair-queue
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
ip flow-cache timeout active 1
ip flow-export source GigabitEthernet0/0
ip flow-export version 5
ip flow-export destination
!
ip route 0.0.0.0 0.0.0.0 10.10.18.1
ip route 10.10.1.0 255.255.255.0 192.168.1.1
ip route 10.10.5.0 255.255.255.0 192.168.8.1
ip route 10.10.9.0 255.255.254.0 192.168.200.2
!
logging trap notifications
logging
!
!
snmp-server community
snmp-server community
!
control-plane
!
!
line con 0
logging synchronous
line aux 0
line vty 0 4
session-timeout 60
privilege level 15
logging synchronous
login
transport input telnet
!
scheduler allocate 20000 1000
end
