2950 Layer 2 problem

elisaabad · ‎06-21-2007

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

INITIAL SITUATION

Server --- 2950 --- router

- Server: 10.0.6.230/24

- Router: 10.0.6.10/24

- The router interface can be pinged from the server

FINAL SITUATION

2821 --- 2950 --- router

- 2821 int vlan200: 10.0.6.230/24

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

- Router: 10.0.6.10/24

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

WHAT I HAVE SEEN DURING THE PROBLEM

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!!

smothuku · ‎06-21-2007

Hi ,

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

Thanks,

Satish

elisaabad · ‎06-21-2007

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 192.168.0.1 255.255.255.0

!

interface FastEthernet1/15

switchport access vlan 200

!

interface GigabitEthernet1/0

switchport access vlan 100

!

interface Vlan100

ip address 172.16.0.3 255.255.255.192

ip virtual-reassembly

!

interface Vlan200

ip address 10.0.6.230 255.255.255.0

ip virtual-reassembly

!

ip route 0.0.0.0 0.0.0.0 172.16.0.1

ip route 10.0.0.0 255.0.0.0 10.0.6.10

vinayrajkp · ‎06-21-2007

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.

ping

Protocol [ip]:

Target IP address: 10.0.6.10

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 10.0.6.10, timeou

Packet sent with a ...

elisaabad · ‎06-22-2007

I will try the change again on monday so I will make this test then.

I'm thinking about sticky ARP in the 2950 would be likely to cause this problem... will let you know after monday.

Thanks