Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

question abt. forwarding decision

Hello!

Assume that Catalyst 3560 switch gets a frame on one of its ports. Let the port be Gi0/3

The frame is an arp-reply paket, so SHA and DHA fields are unicast addresses.

Let the SHA = A.A.A and DHA = B.B.B

When the frame comes onto that interface, the mac-address table on the switch has such entry:

switch#sh mac address-table dynamic vlan 5
          Mac Address Table
-------------------------------------------
Vlan    Mac Address       Type        Ports
----       -----------                --------        -----
5         B.B.B               DYNAMIC   Gi0/3

Question: what will happen with the frame?

Tnx.

Alex.

DAO21-RIPE
1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: question abt. forwarding decision

Hello,

If the catalyst gets an ARP reply on Gi 0/3 and the destination address is

registered on Gi 0/3 itself, then the switch will act like a normal Bridge

and drop the packet.

Regards,

NT

1 REPLY
Cisco Employee

Re: question abt. forwarding decision

Hello,

If the catalyst gets an ARP reply on Gi 0/3 and the destination address is

registered on Gi 0/3 itself, then the switch will act like a normal Bridge

and drop the packet.

Regards,

NT

134
Views
0
Helpful
1
Replies