VoIP over T1 WIC CSU on 2621?

[dvtestguy]

I have two 2621, and need to run VoIP at 70% T1 to verify Tput in a network, and have connected a T1 WIC CSU (internal) between the two (not as a ckt). Do I need to configure a PPP connection to pass traffic, or can I use the config below? Both links are up/up and can ping accross. The config as follows...

Also...I'll use a Hammer device as src/dest to gen calls.

Src---2621---T1---Passive Mon device---T1---2621---Dest.

Config as follows...

Router-1
conf t
interface FastEthernet0/0
ip address 10.115.220.2 255.255.255.0
duplex auto
speed auto
!
interface Serial0/2
ip address 10.115.200.3 255.255.255.0
encapsulation hdlc
bandwidth 1536
service-module t1 framing esf
service-module t1 linecode b8zs
service-module t1 timeslots 1-24 speed 64
service-module t1 data-coding normal
service-module t1 clock source internal
no keepalive
no shut

Router-2
conf t
interface FastEthernet0/0
ip address 10.115.220.3 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
ip address 10.115.200.3 255.255.255.0
encapsulation hdlc
bandwidth 1536
service-module t1 framing esf
service-module t1 linecode b8zs
service-module t1 timeslots 1-24 speed 64
service-module t1 data-coding normal
service-module t1 clock source line
no keepalive
no shut

 

[KiscoKid]

Those configs are fine in my opinion. Usually the default settings work for those kind of modules.

You don't specifically need PPP to run VoIP over the link.

 

[dvtestguy]

Thanks for the tip...I'm guesing I'd be pointing the Hammer device to the FE IP's as well?

 

[KiscoKid]

Yes that should be all you need to do. However what target IP will you be targetting?

If the remote serial.. no problem. If the remote LAN, you'll need a route on the local router telling it how to get there. Something like (in config mode)

(router1) ip route 10.115.200 255.255.255.0 s0/2
(router2) ip route 10.115.220 255.255.255.0 s0/0

 

[dvtestguy]

KiscoKid...I need to target the Serial ports on the 2621's, and looks like I do need to run the setup through a LAN.

1. I have a 6506 as a PE and a 3550 as a CE. There's a Gig-E uplink between the two. The Hammer device is plugged into ports as follows...
6506:
interface FastEthernet4/4
speed 100
duplex full
switchport
switchport access vlan 710
switchport mode access
no cdp enable
end

3550:
interface FastEthernet0/13
switchport access vlan 700
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast trunk
end

The two 2621 configs as follows:
Router-1

conf t
interface FastEthernet0/0
ip address 10.115.220.1 255.255.255.0
duplex auto
speed auto
!
interface Serial0/2
ip address 10.115.200.2 255.255.255.0
encapsulation hdlc
bandwidth 1536
service-module t1 framing esf
service-module t1 linecode b8zs
service-module t1 timeslots 1-24 speed 64
service-module t1 data-coding normal
service-module t1 clock source internal
no keepalive
no shut

Router-2

conf t
interface FastEthernet0/0
ip address 10.115.230.1 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
ip address 10.115.200.3 255.255.255.0
encapsulation hdlc
bandwidth 1536
service-module t1 framing esf
service-module t1 linecode b8zs
service-module t1 timeslots 1-24 speed 64
service-module t1 data-coding normal
service-module t1 clock source line
no keepalive
no shut

My setup does need the LAN as I've been told with the Hammer device.

What routes or additional configs do I need? The 2621's can ping one another on the Serial int, but cannot from the network.

Any ideas?

 

[KiscoKid]

Neither router has a route to the other's LAN. So, you'll need:

router-1
ip route 10.115.230.0 255.255.255.0 s0/2

router-2
ip route 10.115.220.0 255.255.255.0 s0/0

This should mean the routers and indeed anyone on either LAN should be able to see the other LAN.

 

[dvtestguy]

Should I take out the following on both routers?

no ip classless
ip route 0.0.0.0 0.0.0.0 10.15.8.1 (which is the LAN GW)

 

[KiscoKid]

Neither router will know how to get to 10.15.8.1 unless there is a routing protocol running that you haven't included in your config pastes to date.

Both routers will need to know how to default route to 10.15.8.1 however they also need to know how to get to the 10.15.8.x network to achieve this. Can you paste your full router configs here. Also can you confirm which site (router-1 or router-2) this LAN GW resides and whether this GW also has an address on a network either router knows about, i.e. 10.115.230.0 or 10.115.220.0

 

[dvtestguy]

GW (10.15.12.1)
ip subnet-zero
no ip domain-lookup
ip domain-name xxxxxx.net
ip dhcp excluded-address 10.15.12.150 10.15.12.255
ip dhcp excluded-address 10.15.12.50 10.15.12.59
ip dhcp excluded-address 10.15.12.0 10.15.12.25
ip dhcp excluded-address 10.15.12.60 10.15.12.61
!
ip dhcp pool 10.15.12
network 10.15.12.0 255.255.255.0
default-router 10.15.12.1
domain-name ral.am.acterna.net
dns-server 10.15.12.9
lease 10
!
ip dhcp-server 10.15.12.1
lane client flush
!
interface FastEthernet0/0
ip address 10.15.8.2 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
no ip address
shutdown
!
interface FastEthernet0/1
ip address 10.15.12.1 255.255.255.0
duplex auto
speed auto
!
interface Serial0/1
no ip address
shutdown
!
interface Serial0/2
bandwidth 1536
ip address 10.115.200.1 255.255.255.0
encapsulation frame-relay
no keepalive
shutdown
!
router ospf 1
network 10.15.12.1 0.0.0.0 area 1
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.15.8.1
no ip http server
!
access-list 105 deny udp host 10.15.8.2 any
access-list 105 permit ip any any
access-list 106 deny udp 10.15.8.0 0.0.0.255 any
access-list 106 permit ip any any
!
line con 0
transport input none
line aux 0
line vty 0 4
password traffic
login
!
no scheduler allocate
end

Router-1
ip subnet-zero
no ip domain-lookup
ip domain-name xxxxxxxx.net
ip dhcp excluded-address 10.15.12.150 10.15.12.255
ip dhcp excluded-address 10.15.12.50 10.15.12.59
ip dhcp excluded-address 10.15.12.0 10.15.12.25
ip dhcp excluded-address 10.15.12.60 10.15.12.61
!
ip dhcp pool 10.15.12
network 10.15.12.0 255.255.255.0
default-router 10.15.12.1
domain-name xxxxxxx.net
dns-server 10.15.12.9
lease 10
!
ip dhcp-server 10.15.12.1
lane client flush
!
interface FastEthernet0/0
ip address 10.115.220.1 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
no ip address
shutdown
fair-queue
!
interface FastEthernet0/1
ip address 10.15.12.5 255.255.255.0
duplex auto
speed auto
!
interface Serial0/1
no ip address
no ip mroute-cache
no keepalive
shutdown
!
interface Serial0/2
bandwidth 1536
ip address 10.115.200.2 255.255.255.0
no keepalive
service-module t1 clock source internal
service-module t1 timeslots 1-24
!
no ip classless
ip route 0.0.0.0 0.0.0.0 10.15.8.1
ip route 10.115.230.0 255.255.255.0 Serial0/2
no ip http server
!
!
access-list 105 deny udp host 10.15.8.2 any
access-list 105 permit ip any any
access-list 106 deny udp 10.15.8.0 0.0.0.255 any
access-list 106 permit ip any any
snmp-server engineID local 00000009010000A10A0F0803

Router-1 #sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.15.12.1 0 0004.9a51.ec61 ARPA FastEthernet0/1
Internet 10.15.12.3 20 0006.5327.c4e1 ARPA FastEthernet0/1
Internet 10.15.12.2 81 00d0.bb1a.e3ff ARPA FastEthernet0/1
Internet 10.15.12.5 - 0030.85c1.d821 ARPA FastEthernet0/1
Internet 10.15.12.43 0 000b.9001.00a0 ARPA FastEthernet0/1
Internet 10.15.12.57 3 000b.9002.0020 ARPA FastEthernet0/1
Internet 10.115.220.1 - 0030.85c1.d820 ARPA FastEthernet0/0
Router-1#sh ip route
Gateway of last resort is not set

10.0.0.0/24 is subnetted, 4 subnets
C 10.15.12.0 is directly connected, FastEthernet0/1
S 10.115.230.0 is directly connected, Serial0/2
C 10.115.220.0 is directly connected, FastEthernet0/0
C 10.115.200.0 is directly connected, Serial0/2


Router-2
no ip finger
no ip domain-lookup
ip domain-name xxxxxxx.net
ip dhcp excluded-address 10.15.12.150 10.15.12.255
ip dhcp excluded-address 10.15.12.50 10.15.12.59
ip dhcp excluded-address 10.15.12.0 10.15.12.25
ip dhcp excluded-address 10.15.12.60 10.15.12.61
!
ip dhcp pool 10.15.12
network 10.15.12.0 255.255.255.0
default-router 10.15.12.1
domain-name xxxxxxx.net
dns-server 10.15.12.9
lease 10
!
ip dhcp-server 10.15.12.1
no ip dhcp-client network-discovery
!
interface FastEthernet0/0
ip address 10.115.230.1 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0
bandwidth 1536
ip address 10.115.200.3 255.255.255.0
no keepalive
fair-queue
service-module t1 timeslots 1-24
!
interface FastEthernet0/1
ip address 10.15.12.3 255.255.255.0
duplex auto
speed auto
!
router ospf 1
log-adjacency-changes
network 10.15.12.1 0.0.0.0 area 1
!
no ip classless
ip route 0.0.0.0 0.0.0.0 10.15.8.1
ip route 10.115.220.0 255.255.255.0 Serial0/0
no ip http server
!
access-list 105 deny udp host 10.15.8.2 any
access-list 105 permit ip any any
access-list 106 deny udp 10.15.8.0 0.0.0.255 any
access-list 106 permit ip any any
!
line con 0
transport input none
line aux 0
line vty 0 4
exec-timeout 0 0
password traffic
login
transport input telnet
line vty 5 15
login
!
end

Router-2 #sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.15.12.1 0 0004.9a51.ec61 ARPA FastEthernet0/1
Internet 10.15.12.3 - 0006.5327.c4e1 ARPA FastEthernet0/1
Internet 10.15.12.5 19 0030.85c1.d821 ARPA FastEthernet0/1
Internet 10.115.230.1 - 0006.5327.c4e0 ARPA FastEthernet0/0
Router-2 #sh ip route
Gateway of last resort is not set

10.0.0.0/24 is subnetted, 4 subnets
C 10.15.12.0 is directly connected, FastEthernet0/1
C 10.115.230.0 is directly connected, FastEthernet0/0
S 10.115.220.0 is directly connected, Serial0/0
C 10.115.200.0 is directly connected, Serial0/0

 

[KiscoKid]

Ah ok so router-1 already has a connected route to 10.15.8.0 network so if 10.15.8.1 is a LAN GW for this router, then the static you have will be fine. Similarly router-2 has a connected route to 10.15.12.0 however he has a route to 10.15.8.0.

You can either remove that route on router-2 and tell it that network 0.0.0.0 0.0.0.0.0 is via s0/0 (i.e. router-1) OR you can modify the route and tell it 0.0.0.0 0.0.0.0 is via 10.15.12.1

 

[dvtestguy]

I'll try adding that route to router-2, but I'm thinking that if I want to test a large amount of VoIP traffic streams to that network (via 10.15.12.1 GW), that the GW will choke that network?

The other problem is, I cannot ping Router-1 or Router-2 via console from my PC, but can get to the GW.

 

[KiscoKid]

Which address on the router are you pinging? Also what is your PC address?

Also let me know what the IP subnet the Hammer device will reside upon.

 

[dvtestguy]

Trying to ping both FE0/1 on 10.15.12.x. - My PC is on the 10.15.8.x network. - Hammer on the 10.15.8. network

 

[KiscoKid]

I think I need to review some advise I gave previously.

I think you need to add the 0.0.0.0 0.0.0.0 static route to go via 10.15.12.1. Make sure you remove any existing 0.0.0.0 0.0.0.0 route.

Also the first router config you provided above (not router-1 or router-2 - it doesn't seem to have a name) doesn't know how to get to 10.15.200.0x, 10.15.220.x or 10.15.230.x. If you need it to know how to get to these networks, you can either add statics for each of these networks and point them to either router-1 or router-2 as appropriate OR you can add these networks to the OSPF configuration. For instance,

On router-1/router-2:
router ospf 1
network 10.115.0.0 0.0.255.255


I think this will mean your PC and Hammer will be able to access the subnets on router-1 or router-2 now