I have setup a basic VACL applied on a SPAN interface. The problem is that I am beginning to see duplicate packets at the destination port. This was not so a few months back. So what change? Some VLANS are now managed by the FWSM whereas it was before part of the RSM or inside if you may.
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Cisco Internetwork Operating System Software
IOS (tm) s72033_rp Software (s72033_rp-PSV-M), Version 12.2(17d)SXB2, RELEASE SOFTWARE (fc1)
packets are forwarded by the SPAN destination port if the packets get switched on the same VLAN.
WS-X6K-SUP1-2GE, WS-X6K-SUP1A-2GE?Only one packet is forwarded by the SPAN destination port.
so what you saw could be normal.
It applies to all kinds of ethernet ports. if u want to see both tx/rx pkts of a port and also the mcast/broadcast pkts then u will see duplicates of these mcast/brcast pkts...otherwise, u can turn off mcast pkts option in span configuration
The packet duplicate was observed as one way from our environment to the customers. As per the explanation above the same packet from interface outside5 FWSM and F 1/6 were copied to the destination for call recording which caused problems.
By removing the monitor session servicemodule command, outside5 interface was then removed from the source ports of the span.Thus avoiding packet duplications.
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