Urgent. Connecting a Cat2950 to a Cat6509 with MSFC.

[vallan]

I have a single 2950 connecting to a Core Switch6509. The 6509 is a vtp server and the 2950 is set up as a client. I have a crossover cable between the 2 switches from

Cat2950
Int fa0/1
to
Cat6509
Port 7/4.

The connection comes up ok.

On port 7/4, the following is configured

Port Mode Encapsulation Status Native vlan
-------- ----------- ------------- ------------ -----------
7/4 on dot1q trunking 1

On Cat2950

Port Mode Encapsulation Status Native vlan
Fa0/1 on 802.1q trunking 1

Port Vlans allowed on trunk
Fa0/1 1-4094

So the native vlan on both sides of the line is 1, Speed 100 and duplex full.

The Cat2950 has received all vlan information form the vtp sever Cat6509.

I intend to use the MSFCs on the 6509 to do the routing for devices on the 2950 just like a router on a stick.

I next configured an interface on the 2950 as a switch access to vlan 22.

interface FastEthernet0/23
switchport access vlan 22
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast

Vlan 22 has been configured on the MSFcs and this works fine as we have devices on the Cat 6509 which uses it. The Vlan 22 has an ip helper address and my intention is for the devices on the 2950 to also obtain ip addresses from the dhcp server configured thus

interface Vlan22
description Office Network
ip address 10.22.24.251 255.255.255.0
ip helper-address 10.33.33.10
standby 22 ip 10.22.24.254
standby 22 priority 120
standby 22 preempt

But here is where it does not work. When I plug in a device on the 2950, it does not get an ip address, I put in a valid static address in the range and still it will not work.

From the 2950, I can successfully ping the dhcp server and all devices.

So please how do I get devices on the 2950 to use the MSFc as a routing device. In short how do I get this to work.

Thanks

 

[baddos]

do a "show vtp status" on the 2950 and make sure that it pulled down the VLAN config from your 6509 correctly.

-Bad Dos

 

[l1carter]

ok,


First, I assume you did the no shut on interface 0/23 of the 2950 switch so with that said here is what I would do:

**** on the 2950 *****

1. do a show vlan and verify that you are getting vlan 22 to the 2950 switch.
2. do a show interface 0/23 switchport and verify that your port is up/up
3. do a show interface 0/23 and verify that you have both input/output packets on that interface and no errors

***** On the 6509 *****

1. do a show standby vlan 22 and verify that it is the active interface for that vlan! If not log into the other MSFC and look at that for possible errors.
2. Do a show interface vlan 22 and verify that it is up/up
3. Do an extended ping to the dhcp server using interface vlan 22 as the source interface!

 

[vallan]

Thank you all so very very much. I really appreciate your help.

I plugged in devices on to the 2950 and did a
show mac-address and could see it and did a
show cam on the 6509 and i could see the mac address of the device. At least at L2 level, it was ok

I did a reboot before this and this cleared the cache entry which i think was messed up. And everything worked fine after this.

The portfast on the int fa0/1 is disabled and those on the ohter interfaces are all enabled on the 2950. While the int 7/4 on the 6509 is also portfast disabled.

All worked well.

Thank you so very much