Unable to ping 2950 over a trunk

[pbeck0001]

Hello,

I've got a 2950 trunked to a 3750 in my network.  The computers connected to the 2950 are able to pass traffic to the rest of the network over the trunk and vice versa, but I am unable to ping the 2950's SVI over the trunk.  When I bring the 2950 in and connect it to an access port on the 3750, the 2950's SVI is pingable.  So this leads me to believe there is a problem with the trunk.  Anyone have suggestions or ideas?

thanks,

[WuTangClan]

Do you have a default gateway set on the 2950?

[pbeck0001]

Yes, a default gateway is set on the 2950.

[Martin Carr]

Is the 2950 SVI on the same VLAN as the the other nodes?

Martin

[Richard Burts]

I believe that Martin is on the right track. Can the original poster tell us what IP address is configured on the 2950, what vlan interface it is configured on, what is the configured default gateway, and what vlan is used on the 2950 for user traffic?

HTH

Rick

[pbeck0001]

The Client VLAN is 192.168.1.x

Public VLAN is 10.1.1.x

The Server VLAN is 192.168.100.x

The Switches Management IPs are 192.168.248.x

The IP of the 2950 SVI is 192.168.100.10.  It is on VLAN 1.

The Default Gateway is 192.168.100.1

All of the switches are 3750's that trunk to a core router in the server room.  The 2950 is the exception.  It sits in an outbuilding and trunks to a 3750.  Like I said the 3 computers in there can pass traffic in & out. The client vlan and public vlan are used for user traffic.

[Martin Carr]

The clients working are irrelevant.

The problem is the SVI is not configured on the Server VLAN ID, so you just need to do this and assuming it is permitted to traverse the trunk, will work.

Martin

[pbeck0001]

I'm confused.  The Server VLAN is 192.168.100.x.  Which is VLAN 1.  The ip of the SVI is 192.168.100.10.  How is that not on the same VLAN? 

[Richard Burts]

Can you post the configuration of interface vlan 1? Also can you post the output of the command show arp on the switch?

I am a bit confused about the statement "The Switches Management IPs are 192.168.248.x" which seems inconsistent with the statement that the 2950 management IP seems to be 192.168.100.10. Can you clarify this?

HTH

Rick

[Martin Carr]

As you didn't mention the ID, I assumed it would be different from the default (which isn't recommended).

Knowing that, I suspect the reason is because you do not have anything physically connected to that VLAN on the switch, which is needed to bring the SVI up.

But as per Richard's comment, I would question as to why this on the Server VLAN, which is strange?

Martin

[pbeck0001]

Yes, for whatever reason all of our switches use 192.168.248.x except for this one.  It is on the other end of a trunk from a 3750.  Its in an outbuilding that is somewhat remote from our main buildings.  I've inherited this network and haven't figured out why this one switch was setup this way.

[pbeck0001]

I've pulled the 2950 from its rack and its sitting in my office with only the console cable connected to it.

Here's the config of vlan1 on the 2950:

2950-24-08#show int vlan1
Vlan1 is up, line protocol is down
  Hardware is CPU Interface, address is 000a.41bf.9a80 (bia

000a.41bf.9a80)
  Internet address is 192.168.100.10/24
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 2 interface resets
     0 output buffer failures, 0 output buffers swapped out
2950-24-08#"

Here's the show arp command:

"2950-24-08#show arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  192.168.100.10          -   000a.41bf.9a80  ARPA   Vlan1
2950-24-08#"

[Richard Burts]

There are a few things wrong with this response:

- we asked for the configuration of int vlan 1 and you give us the output of show int vlan 1. Show int is absolutely not the same as the config of the interface.

- If the switch is in your office and has no interface connected except its console then the output of show interface and of show arp will be meaningless, since there is nothing for the switch to connect to and to populate those tables.

HTH

Rick