Document ID: 14067
Contents
Introduction
Prerequisites
Requirements
Justification
Design
Network Diagram
Configurations
Verify
Troubleshoot
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Related Information
Introduction
This is a case study with sample configurations from a large American based banking institution. This bank has been utilizing Cisco 2600 based VoIP technology to support their small to medium size branches in South America. This approach has saved the bank hundreds of thousands of dollars over the last two years and has been very stable since the day it was implemented.
Prerequisites
Requirements
There are no specific requirements for this document.
Justification
The bank decided to roll out Cisco 2600 Routers to the small and medium size branch locations to consolidate the amount of equipment that needed to be managed and simultaneously save money with toll bypass.
Design
The design consists Cisco 2600 Routers at the South American branches and a single Cisco 2600 at the head end. Voice switching is used to avoid one for one port assignments. Fragmentation and interleaving must be used so that large data packets do not queue before voice packets, which would cause undo delay to the voice. Link fragmentation and interleaving is achieved using Multilink Point-to-Point Protocol (MLP).
Note: There are four configuration samples in this document. The first two configuration samples are used for Cisco 2600 Routers that run a release earlier than Cisco IOS® Software Release 12.0(5)T. The second two configuration samples are for Cisco 2600 Routers that run Cisco IOS Software Release 12.0(5)T or later. The second two sample configurations are recommended for a network situation such as the one in the Network Diagram here. The point-to-point topology is shown in this Network Diagram.
In order to implement this configuration, you need:
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Either Cisco IOS Software Release 11.3 or Cisco IOS Software Release 12.0(5)T or later. Cisco IOS Software Release 12.0(5)T or later is recommended.
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Cisco 2600 Routers connected via MLP.
Network Diagram
This document uses this network setup:
Configurations
This document uses these configurations:
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Central Router with Cisco IOS Software 11.3 and Earlier |
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2600-1#show run ! version 11.3 ! hostname 2600-1 ! enable password cisco ! multilink virtual-template 1 ! dial-peer voice 10 voip destination-pattern 5 ip precedence 5 session target ipv4:10.100.101.1 ! dial-peer voice 11 voip destination-pattern 6 ip precedence 5 session target ipv4:10.100.101.1 ! dial-peer voice 12 voip destination-pattern 8 ip precedence 5 session target ipv4:10.100.101.1 ! dial-peer voice 13 voip destination-pattern 9 ip precedence 5 session target ipv4:10.100.101.1 ! dial-peer voice 1 pots destination-pattern 7 port 1/0/0 ! dial-peer voice 2 pots destination-pattern 7 port 1/0/1 ! dial-peer voice 3 pots destination-pattern 7 port 1/1/0 ! dial-peer voice 4 pots destination-pattern 7 port 1/1/1 ! ! voice-port 1/0/0 vad connection plar 5 ! voice-port 1/0/1 vad connection plar 6 ! voice-port 1/1/0 vad connection plar 8 ! voice-port 1/1/1 vad connection plar 9 clock timezone EST -5 clock summer-time DST recurring ! interface Loopback1 ip address 10.100.253.1 255.255.255.0 ! interface Ethernet0/0 ip address 10.175.238.29 255.255.255.0 ! interface Serial0/0 no ip address shutdown ! interface Serial0/1 no ip address shutdown ! interface Serial0/2 encapsulation ppp bandwidth 64 load-interval 30 no fair-queue ppp multilink ! interface Virtual-Template1 ip unnumbered Loopback1 ip rtp header-compression ip rtp reserve 16384 50 bandwidth 64 fair-queue 64 256 10 ppp multilink ppp multilink fragment-delay 20 ppp multilink interleave ! router ospf 99 network 10.100.253.1 0.0.0.0 area 21 network 10.175.0.0 0.0.255.255 area 0 ! ip classless ! line con 0 exec-timeout 15 0 line aux 0 exec-timeout 25 0 transport input all line vty 0 4 exec-timeout 15 0 ! end |
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Branch Router with Cisco IOS Software 11.3 and Earlier |
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2600-2#show run ! version 11.3 ! hostname 2600-2 ! enable password cisco ! multilink virtual-template 1 ! dial-peer voice 1 pots destination-pattern 5 port 1/0/0 ! dial-peer voice 2 pots destination-pattern 6 port 1/0/1 ! dial-peer voice 3 pots destination-pattern 8 port 1/1/0 ! dial-peer voice 4 pots destination-pattern 9 port 1/1/1 ! dial-peer voice 10 voip destination-pattern 7 ip precedence 5 session target ipv4:10.175.238.29 ! ! voice-port 1/0/0 vad connection plar 7 ! voice-port 1/0/1 vad connection plar 7 ! voice-port 1/1/0 vad connection plar 7 ! voice-port 1/1/1 vad connection plar 7 clock timezone est -5 clock summer-time dst recurring ! ! ! interface Loopback1 ip address 10.100.253.2 255.255.255.0 ! interface Ethernet0/0 ip address 10.100.101.1 255.255.255.0 ! interface Serial0/0 no ip address ! interface Serial0/1 no ip address ! interface Serial0/2 no ip address encapsulation ppp bandwidth 64 load-interval 30 no fair-queue ppp multilink ! interface Virtual-Template1 ip unnumbered Loopback1 ip rtp header-compression ip rtp reserve 16384 50 64 bandwidth 64 fair-queue 64 256 10 ppp multilink ppp multilink fragment-delay 20 ppp multilink interleave ! router ospf 99 network 10.100.101.0 0.0.0.255 area 21 network 10.100.253.2 0.0.0.0 area 21 ! ip classless ! line con 0 exec-timeout 15 0 line 1 transport input all line 2 transport input all line aux 0 exec-timeout 25 0 transport input all line vty 0 4 exec-timeout 15 0 login ! end |
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Central Router with Cisco IOS Software 12.0(7)T |
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2600-1#show run ! version 12.0 ! hostname 2600-1 ! enable password cisco ! dial-peer voice 10 voip destination-pattern 5 ip precedence 5 session target ipv4:10.100.101.1 ! dial-peer voice 11 voip destination-pattern 6 ip precedence 5 session target ipv4:10.100.101.1 ! dial-peer voice 12 voip destination-pattern 8 ip precedence 5 session target ipv4:10.100.101.1 ! dial-peer voice 13 voip destination-pattern 9 ip precedence 5 session target ipv4:10.100.101.1 ! dial-peer voice 1 pots destination-pattern 7 port 1/0/0 ! dial-peer voice 2 pots destination-pattern 7 port 1/0/1 ! dial-peer voice 3 pots destination-pattern 7 port 1/1/0 ! dial-peer voice 4 pots destination-pattern 7 port 1/1/1 ! ! voice-port 1/0/0 vad connection plar 5 ! voice-port 1/0/1 vad connection plar 6 ! voice-port 1/1/0 vad connection plar 8 ! voice-port 1/1/1 vad connection plar 9 clock timezone EST -5 clock summer-time DST recurring ! interface Multilink1 ip address 10.100.253.1 255.255.255.0 no ip directed-broadcast no ip route-cache ip tcp header-compression iphc-format no ip mroute-cache fair-queue 64 256 1000 no cdp enable ppp multilink ppp multilink fragment-delay 20 ppp multilink interleave multilink-group 1 ip rtp header-compression iphc-format ip rtp priority 16384 50 64 ! interface Ethernet0/0 ip address 10.175.238.29 255.255.255.0 ! interface Serial0/0 no ip address no fair-queue ! interface Serial0/1 no ip address shutdown ! interface Serial0/2 no ip address no ip directed-broadcast encapsulation ppp no ip route-cache no ip mroute-cache bandwidth 64 load-interval 30 no fair-queue ppp multilink multilink-group 1 ! router ospf 99 network 10.100.253.1 0.0.0.0 area 21 network 10.175.0.0 0.0.255.255 area 0 ! ip classless ! line con 0 exec-timeout 15 0 line aux 0 exec-timeout 25 0 transport input all line vty 0 4 exec-timeout 15 0 ! end |
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Branch Router with Cisco IOS Software 12.0(7)T |
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2600-2#show run ! version 12.0 ! hostname 2600-2 ! enable password cisco ! dial-peer voice 1 pots destination-pattern 5 port 1/0/0 ! dial-peer voice 2 pots destination-pattern 6 port 1/0/1 ! dial-peer voice 3 pots destination-pattern 8 port 1/1/0 ! dial-peer voice 4 pots destination-pattern 9 port 1/1/1 ! dial-peer voice 10 voip destination-pattern 7 ip precedence 5 session target ipv4:10.175.238.29 ! ! voice-port 1/0/0 vad connection plar 7 ! voice-port 1/0/1 vad connection plar 7 ! voice-port 1/1/0 vad connection plar 7 ! voice-port 1/1/1 vad connection plar 7 clock timezone est -5 clock summer-time dst recurring ! ! interface Multilink1 ip address 10.100.253.2 255.255.255.0 no ip directed-broadcast no ip route-cache ip tcp header-compression iphc-format no ip mroute-cache load-interval 30 fair-queue 64 256 1000 no cdp enable ppp multilink ppp multilink fragment-delay 20 ppp multilink interleave multilink-group 1 ip rtp header-compression iphc-format ip rtp priority 16384 50 64 ! interface Ethernet0/0 ip address 10.100.101.1 255.255.255.0 ! interface Serial0/0 physical-layer async no ip address ! interface Serial0/1 physical-layer async no ip address ! interface Serial0/2 no ip address no ip directed-broadcast encapsulation ppp no ip route-cache bandwidth 64 load-interval 30 no fair-queue ppp multilink multilink-group 1 ! router ospf 99 network 10.100.101.0 0.0.0.255 area 21 network 10.100.253.2 0.0.0.0 area 21 ! ip classless ! line con 0 exec-timeout 15 0 line 1 no exec-banner transport input all line 2 transport input all line aux 0 transport input all line vty 0 4 exec-timeout 15 0 login ! end |
Verify
There is currently no verification procedure available for this configuration.
Troubleshoot
There is currently no specific troubleshooting information available for this configuration.
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Related Information
- Voice Technology Support
- Voice and Unified Communications Product Support
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Recommended Reading: Troubleshooting Cisco IP Telephony
- Technical Support & Documentation - Cisco Systems
| Updated: Feb 02, 2006 | Document ID: 14067 |