Bonding T-1's on Cisco routers for Voip

[samsausagehead]

Help, Like many others I am attempting to do voip over serial interfaces. I need a way to Bond 3 t1's and reduce cpu utilization. I am using vrf Tunneling to reach my Satellites. Will Multilink ppp encap. work or will I have to use default cef.

Samsausagehead

controller T1 0/0/0
framing esf
linecode b8zs
channel-group 0 timeslots 1-24
description -wan Ser 1/0/1:0
!
controller T1 0/0/1
framing esf
linecode b8zs
channel-group 0 timeslots 1-24
description -wan T1 0/3/1
!
controller T1 0/1/0
framing esf
linecode b8zs
channel-group 0 timeslots 1-24
description -wan T1 1/0/1
!
controller T1 0/1/1
shutdown
framing esf
linecode b8zs
!
!
!
!
interface Tunnel19200168
ip vrf forwarding voip
ip address x.x.x.x 255.255.255.252
tunnel source Loopback0
tunnel destination x.x.x.x.
interface Loopback0
description VoIP
ip address x.x.x.x 255.255.255.255
!
interface FastEthernet0/0
no ip address
ip route-cache flow
duplex auto
speed auto
!
interface FastEthernet0/0.3848
description voip
encapsulation dot1Q 3848
ip vrf forwarding voip
ip address x.x.x.x 255.255.255.192
no snmp trap link-status
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0/0:0
description -wan ser1/0/1:0
ip unnumbered Loopback0
ip route-cache flow
!
interface Serial0/0/1:0
description -wan serial 2/1/0:0
ip unnumbered Loopback0
ip route-cache flow
!
interface Serial0/1/0:0
description -wan 0/3/1:0
ip unnumbered Loopback0
ip route-cache flow
!
router ospf 1112 vrf voip
log-adjacency-changes
area x.x.x.x stub
network x.x.x.x 0.0.0.3 area 0.0.0.0
network x.x.x.x 0.0.0.0 area x.x.x.x
!
router ospf 1111
log-adjacency-changes
area x.x.x.x. stub
network x.x.x.x. 0.0.3.255 area 0.0.0.0

 

[BuckWeet]

Multilink PPP is your answer as you thought..

might i ask why you have deployed VRFs??? VRFs are only used for virtualizing the routing tables.. mainly used in MPLS networks.. I don't see how this buys you anything on your implementation..

As for 3 T1's, I'd seriously question the processing capability of a 1760 router when using multilink PPP..


buckweet

 

[BuckWeet]

lol, sorry.. i had 1760 on my mind from another post.. question still remains, what model of router are you running?

 

[samsausagehead]

I'm presently using cisco 2811, the cpu utilization get up to 35 or 40 and call quality degrades. The vrf is for the voip core that is being ran thought the network. The multilink ppp seems to work fine but the cpu utilization is still the major factor.

 

[BuckWeet]

Time to upgrade your router then.. No way around it.. Multilink PPP requires quite a bit of processor power.