Solved: Unable to get TFTP Config to IP Phone

johnlloyd_13 · ‎07-13-2009

hi experts,

i have a 3845 router and 3560 switch. i had an issue wherein i can't get my 1140e nortel ip phone settings (server unreachable) when connecting to 3560e switch. previously i was able to have it worked during my initial config (ip addressing, vlan and interface vlan configs) for the switch and router. and then i've added acl, qos etc along the way. then i tested my ip phone again, it doesn't get its config. from the switch, i can ping to our dhcp (172.25.22.10) and nortel pabx server (172.25.202.15) from vlan voice (vlan 1076) as source. i used the ip phone to troubleshoot, i can ping to the voice gw (172.25.227.253). my belief there's a line or config blocking my connection. i've exhausted all troubleshooting needed all day. i need a fresh set of eyes to look into my config and verify with me so that i can continue testing tomorrow. thanks in advance!

Collin Clark · ‎07-13-2009

We ended up hard setting the information in the phones instead of using the DHCP options. We couldn't get it to pass everything correctly. I've attached a Nortel DHCP configuration guide.

Hope it helps.

View solution in original post

xcz504d1114 · ‎07-13-2009

I don't see any ip helper address on your router. Also check your DHCP server and make sure option 150 is set.

-Edit- I looked over the configs again when I got to work, you have your helper-addresses on the switch, the only thing left is Option 150.

HTH,

Craig

Giuseppe Larosa · ‎07-13-2009

Hello John,

your configuration looks like fine.

Sorry for the basic question:

Have you checked the presence of option 150 in the DHCP scope for the IP subnet associated to vlan1076 on the DHCP server(s) ?

I don't see any ACL on the two devices

And where is pabx server 172.25.205.15 check all the path to it

Hope to help

Giuseppe

Jerry Ye · ‎07-13-2009

Hi John, Giuseppe, and Craig,

Nortel is not using option 150. Apprently they have used lots of different DHCP options, and the most likely they are using option 128 right now.

http://lists.sans.org/pipermail/unisog/2005-October/025381.html

http://blog.michaelfmcnamara.com/2007/10/dhcp-options-voip/

HTH,

jerry

xcz504d1114 · ‎07-13-2009

Good to know! Thanks Jerry.

Craig

Thotsaphon Lueangwattanaphong · ‎07-13-2009

John,

Are you running a routing protocol between these two devices? Please post the entire configuration on Sw3560.

- Your uplink is in vlan 124(access port).

- How does router know about vlan 1076? Do you want to add static route to route it back or run routing protocol(ospf) on both devices?

Well, You've used a static route. I'm glad to see a redistribute static there (grin)

- Seems you need Sw3560 to act as L3 switch. Please post a "show ip route" command on this switch . I need to know things.

- Please let me know if you pretend to be vlan 1076 from the existing configuration on Sw3560(just one port for testing) you will then get these 2 servers ,172.25.202.15 and 172.25.22.10. Does it work? (grin)

- Please post a "show ip route" command on the router.

Before talking about the dhcp option I would know what your network path looks like.

John,I assumed things as follows:

#####For switch3560######

!

ip routing

!

no ip default-gateway 172.25.124.253

!

ip route 0.0.0.0 0.0.0.0 172.25.124.253

!

HTH,

Toshi

Collin Clark · ‎07-13-2009

We ended up hard setting the information in the phones instead of using the DHCP options. We couldn't get it to pass everything correctly. I've attached a Nortel DHCP configuration guide.

Hope it helps.

johnlloyd_13 · ‎07-14-2009

thanks for everyone's inputs. but collin did the job! config and routing was working properly. it's just the ip phone settings that had the problem.