Dear all,

For my company, there are two equipment rooms, one is in upstair ad one is
in downstair. So we are using fiber connecting these two floor equipments by
using Cisco 2950 (which having 2 Fiber port) in both upstair and downstair.

In cisco 2950, there are 24 ports, for some reason, I need to set 12 ports
for VLAN1 (IP address A.B.C.0/24) andb 12 ports for VLAN2(E.F.G.0/24) in
upstair cisco 2950. Note that port 25 is also VLAN1 and port 26 is VLAN2.
The same applied to downstair cisco 2950 (Now we have two fibers connecting
to upstair and downstair cisco 2950). The result why connected like this is
we want to seperate the traffic for VLAN1 and VLAN2.

The config is like this

upstair and downstair cisco 2950 switch config
==============================================
Port 1 to port 12:

under interface FastEthernet0/1 to 0/12 - no special config (default)

Port 13 to port 24:

under interface FastEthernet0/13 to 0/24 - adding "switchport access vlan 2"

Assign ip address for upstair cisco 2950:

interface VLAN1
 ip address A.B.C.1 255.255.255.0

Assign ip address for downstair cisco 2950:

interface VLAN1
 ip address A.B.C.2 255.255.255.0

But when I issue a command show arp, I see very strange situation.

Actually from my knowledge, the arp table should contains only local arp
table. But I find that there are some external address on my arp table. WHY?
Really not understanding? Is my config for VLAN is wrong?

Also when I issue a command "show vlan brief", I get the following output:

VLAN  Name               Status    Ports
---- --------            --------- ------
1    default             active    Fa0/1,Fa0/2, ... ,Fa0/12,Fa0/25
2    VLAN0002            active    Fa0/13,Fa0/14, ... , Fa0/24, Fa0/26
1002 fddi-default        active
1003 token-ring-default  active
1004 fddinet-default     active
1005 trnet-default       active

which I believe that I am not setting wrong for VLAN. Any comment or
suggestion? Thx!



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