question abt. forwarding decision

Answered Question
Aug 25th, 2010

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.

I have this problem too.
0 votes
Correct Answer by Nagaraja Thanthry about 6 years 3 months ago

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

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Correct Answer
Nagaraja Thanthry Wed, 08/25/2010 - 06:14

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

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