2950 Layer 2 problem

Unanswered Question

Hello! I'm trying to replace a Windows Server using a 2821 router.


Server --- 2950 --- router

- Server:

- Router:

- The router interface can be pinged from the server


2821 --- 2950 --- router

- 2821 int vlan200:

- 2821 int fa1/15: no ip address, switchport access vlan 200

- Router:

- The router interface can't be pinged from the 2821


The physical layer link to the switch seems ok.

I can see the 2950 switch with a "sh cdp neighbors"

I can see the router's mac in vlan200 with a "show arp"

I think the problem could be related to the 2950 arp or mac-address table but I can't access the 2950 nor the remote router.

Any idea of what is going on? Thanks!!

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smothuku Thu, 06/21/2007 - 01:48
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Hi ,

Can you paste the config of 2821 and router..Is there anything configured on 2950 switch...



Hello, I don't manage the 2950 switch nor the remote router. I can only check the 2821 and I think everything is ok in my configuration.

This is the config in the 2821:

version 12.4


ip cef


interface GigabitEthernet0/0

ip address


interface FastEthernet1/15

switchport access vlan 200


interface GigabitEthernet1/0

switchport access vlan 100


interface Vlan100

ip address

ip virtual-reassembly


interface Vlan200

ip address

ip virtual-reassembly


ip route

ip route

vinayrajkp Thu, 06/21/2007 - 04:30
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Can you do an extended ping from the fa1/15 interface? For extended ping type ping on the command prompt. for Extended commands answer "y" and then give the source interface as FastEthernet1/15.example shown below. Please do tell us the result.


Protocol [ip]:

Target IP address:

Repeat count [5]:

Datagram size [100]:

Timeout in seconds [2]:

Extended commands [n]: y

Source address or interface: FastEthernet1/15

Type of service [0]:

Set DF bit in IP header? [no]:

Validate reply data? [no]:

Data pattern [0xABCD]:

Loose, Strict, Record, Timestamp, Verbose[none]:

Sweep range of sizes [n]:

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to, timeou

Packet sent with a ...


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