09-13-2009 02:10 AM
Hello,
Does anybody know the specifications about port mirroring funcionality for Cisco SRW2048 48-Port Gigabit Switch?
I need to know about:
1.- Is there any limit in port mirroring sessions?
2.- Can one target port receive traffic from multiple ports?
Solved! Go to Solution.
09-13-2009 07:33 AM
Hi Alejandro,
I'm not sure what you mean by 'sessions' , but i'll explain a common sense limit on mirroring a little later.
But for a test, I pulled up my SRW2008P, even though not a SRW2048 and produced the following screen shot at the following community location.
https://www.myciscocommunity.com/message/15201#15201
You can usually mirror both TX and RX traffic from about four ports to a fifth port, even on the SRW2048. But you can, as you wish, limit to only RX traffic from the switches perspective.
In terms of limits to mirrored sessions, there is a common sense limit .
If the four switch ports to be mirrored are running at very high port utilisation and you are capturing 3 or 4 switch ports and directing that traffic to a 5th switch port for mirroring purposes, expect packets to be dropped as it egresses out to the mirrored port. I hope that make sense. You can't have 4Gbits/sec egressing out a mirrored ports to your PC or capturing utility. :-)
regards Dave
09-14-2009 12:35 PM
Hi Alejandro,
This switch only supports 1 session - i.e. 1 target mirror port. SRW and SFE/SGE switches can have up to 8 source ports while the SLM switches can have up to 4 source ports.In every case there is only one target mirror port.
Thanks,
Ivor
09-13-2009 07:33 AM
Hi Alejandro,
I'm not sure what you mean by 'sessions' , but i'll explain a common sense limit on mirroring a little later.
But for a test, I pulled up my SRW2008P, even though not a SRW2048 and produced the following screen shot at the following community location.
https://www.myciscocommunity.com/message/15201#15201
You can usually mirror both TX and RX traffic from about four ports to a fifth port, even on the SRW2048. But you can, as you wish, limit to only RX traffic from the switches perspective.
In terms of limits to mirrored sessions, there is a common sense limit .
If the four switch ports to be mirrored are running at very high port utilisation and you are capturing 3 or 4 switch ports and directing that traffic to a 5th switch port for mirroring purposes, expect packets to be dropped as it egresses out to the mirrored port. I hope that make sense. You can't have 4Gbits/sec egressing out a mirrored ports to your PC or capturing utility. :-)
regards Dave
09-13-2009 09:04 AM
Hi Dave,
Thanks for your answer, of course I understand I can't have 4 Gbps out of the egress port, bust sometimes we know that even when the link is 1 Gbps the traffic is not going to fill that bandwidht.
Regarding the sessions question, I understand by your response you can have:
Source Port Type Target port
g1 Rxonly g3
g2 Rxonly g3
g4 Rxonly g6
g5 Both g6
Can you confirm this?
We are evaluating to propose this switch to a customer and we need to have this feature.
If there isn't any limitation in mirroring traffic, except logical bandwith capabilities, then I can't understand why Catalyst 2960 have a limitation to one or two monitor sessions ... The catalyst are suposed to be better switches ......
Best Regards
09-13-2009 09:41 AM
Hi Alejandro,
I am working on a assumption, and i have seen no caveats, that if the management interface allows 4 or 5 switch ports to be mirrored to one switch port, it should work. I must admit I have only used port mirroring for diagnostic purposes, but plenty of people out there use mirroring for UTM purposes.
I will copy this thread to the SRW product manager for confirmation regarding any caveat. :)
regards Dave
09-14-2009 12:35 PM
Hi Alejandro,
This switch only supports 1 session - i.e. 1 target mirror port. SRW and SFE/SGE switches can have up to 8 source ports while the SLM switches can have up to 4 source ports.In every case there is only one target mirror port.
Thanks,
Ivor
09-15-2009 05:07 AM
Hi Ivor,
Thanks very much, that is exactly the information I needed.
Best Regards
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