adding another T-1

Unanswered Question
Feb 11th, 2008

i have a branch office on our IPT system with one t-1 - we want to add another t1. if i multilink these two t-1's will i experience any issues with the voice?

I have this problem too.
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kapil.atrish Fri, 02/22/2008 - 01:43

HI,

I was checking the similar requirements. I think there could be voice quality issue due to physical disparities on T1 circuits. If there are errors/delay on one link, there will be packet losses/jitter causing bad quality to all voip connections.

Thanks,

Kapil Atrish

jerry.mcrae Fri, 02/22/2008 - 09:18

i added the multilink last night and ive noticed a strange issue with QOS. i cant add my service policy to one on the interfaces in the multilink.

SSF_CORP#conf t

SSF_CORP(config)#interface Serial0/1/0:0

SSF_CORP(config-if)#service-policy output EWT_SP

SSF_CORP(config-if)#end

SSF_CORP#sh run int Serial0/1/0:0

interface Serial0/1/0:0

description 2ND T-1

bandwidth 1536

ip unnumbered FastEthernet0/0.10

no ip redirects

no ip unreachables

no ip proxy-arp

encapsulation ppp

ip route-cache flow

ip tcp header-compression iphc-format

ppp multilink

ppp multilink group 90

max-reserved-bandwidth 100

ip rtp header-compression iphc-format

ip rtp compression-connections 64

i also get this when i do a sh policy-map interface Serial0/0/0

Queueing [suspended, using FIFO]

what gives?

jerry.mcrae Fri, 02/22/2008 - 09:56

i have but check this out. one side of the multi i get this during sh policy-map (router 2)-

Class-map: voice-traffic (match-any)

323169 packets, 42269160 bytes

5 minute offered rate 25000 bps, drop rate 0 bps

Match: ip dscp ef (46)

269929 packets, 38969247 bytes

5 minute rate 22000 bps

Match: ip rtp 16384 16383

53240 packets, 3299913 bytes

5 minute rate 0 bps

Queueing

Strict Priority

Output Queue: Conversation 264

Bandwidth 39 (%)

Bandwidth 1198 (kbps) Burst 29950 (Bytes)

(pkts matched/bytes matched) 26101/3192422

(total drops/bytes drops) 0/0

on the other side i get this (Router1)-

Class-map: voice-traffic (match-any)

406971 packets, 52744324 bytes

5 minute offered rate 54000 bps, drop rate 0 bps

Match: ip dscp ef (46)

406971 packets, 52744324 bytes

5 minute rate 54000 bps

Match: ip rtp 16384 16383

0 packets, 0 bytes

5 minute rate 0 bps

Queueing

Strict Priority

Output Queue: Conversation 264

Bandwidth 39 (%)

Bandwidth 1198 (kbps) Burst 29950 (Bytes)

(pkts matched/bytes matched) 0/0

(total drops/bytes drops) 0/0

router 2 -> (pkts matched/bytes matched) 26101/3192422

router 1 -> (pkts matched/bytes matched) 0/0

same config on both sides. im reading a white paper on this now. ideas?

thanks - jerry

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