You are welcome. I don't think there is a workaround to the problem that I mentioned. At least on my Catalyst 1900 I was not able to turn off the "port block unicast" and "port block multicast" on the monitor port. This meant that I did not see this type of traffic on my analyzer. The source (monitored) ports saw it, but the monitor port did not.
Have you found a workaround to this problem? Thanks. Priscilla At 01:30 AM 1/4/02, Chong Chun Wei (Central) wrote: >Thanks guy... I can now mirror the source port after enable the >flood unknown >unicast traffic and unregistered multicast traffic > >Alvin > >-----Original Message----- >From: Stefan Dozier [mailto:[EMAIL PROTECTED]] >Sent: Friday, January 04, 2002 9:17 AM >To: [EMAIL PROTECTED] >Subject: RE: setting SPAN on Cat 1900 [7:30746] > > >A perfect example of the collective in action! > >Thanks Priscilla.... > >Stefan > > >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of >Priscilla Oppenheimer >Sent: Thursday, January 03, 2002 5:44 PM >To: [EMAIL PROTECTED] >Subject: RE: setting SPAN on Cat 1900 [7:30746] > > >At 04:41 PM 1/3/02, Stefan Dozier wrote: > >Please post replies to the list! That way you can benefit from > >the wide ranging knowledge and wisdom of the groupstudy collective! > >Excellent advice. He sent the same question to my private unicast address >and I ignored it. ;-) But I will answer questions to the collective. > >I have also run into surprising results with port monitoring on a 1900. I >don't always see all the traffic I expect to see. I think we discussed this >before and it might be in the archives. > >I discovered that some Cisco switches disable the forwarding of unknown >(flooded) unicast traffic and unregistered multicast traffic to the monitor >port. The goal is to protect the network from problems associated with this >traffic exiting an additional port. Check to see if the 1900 switch >automatically added the "port block unicast" and "port block multicast" >commands to the monitor port. This can make troubleshooting difficult. > >I don't think you can get it not to do this. The workaround is to use a >higher-end switch. > >Priscilla > > > >As to your observation: Not really sure what's going on! > > > >You could double check just to make sure that only the ports > >you're looking to monitor are enabled! > > > >Also I'll throw this out there and maybe someone else can > >comment or correct me if I'm way out in left field. > > > >I seem to remember in one the switch models (maybe the 2900XL's) > >where the port monitor command actually monitors all ports > >belonging to the same vlan as the monitor port. Not sure if the > >1900's are doing something similar or not! > > > >Stefan > > > > > >-----Original Message----- > >From: Chong Chun Wei (Central) [mailto:[EMAIL PROTECTED]] > >Sent: Thursday, January 03, 2002 12:24 AM > >To: 'Stefan Dozier' > >Subject: RE: setting SPAN on Cat 1900 [7:30746] > > > > > >Thanks Stefan.. > > > >I have enabled the monitor-port, and set the source and destination port. > >And the result is I can now see some traffic traversing thru the >destination > >port. > >BUT.. after some observation I found out that the traffic between the >source > >and dest are different!! So what's go wrong? Is there anythin else I left > >out? > >I even set both the port to the same vlan.. > >Please help > > > >-Alvin- > > > >-----Original Message----- > >From: Stefan Dozier [mailto:[EMAIL PROTECTED]] > >Sent: Thursday, January 03, 2002 12:18 PM > >To: [EMAIL PROTECTED] > >Subject: RE: setting SPAN on Cat 1900 [7:30746] > > > > > > From the command-line: If your switch is an Enterprise Edition > > > >monitor-port monitor-port port 0/27 monitor-port monitored 0/3 > >See this link for a more detailed description of the commands: > >Watch the word wrap.... > > > >http://www.cisco.com/univercd/cc/td/doc/product/lan/28201900/1928v9x/cli/pa >r > >t1.htm#xtocid1592767 > > > > From the Management Console (Main Menu) > > > >Depress [M] Monitoring and follow the menu selections to enable > >monitoring, and select the the ports your analyzer is connected > >to and the port(s) you want to monitor. > > > > > >HTH > > > >Stefan > > > > > > > >-----Original Message----- > >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of > >Chong Chun Wei (Central) > >Sent: Wednesday, January 02, 2002 9:50 PM > >To: [EMAIL PROTECTED] > >Subject: setting SPAN on Cat 1900 [7:30746] > > > > > >Dear all, > > > >Is is possible to set SPAN on a catalyst 1900? If yes, how? > >Thankyou. > > > >Cheers, > >Alvin Chong > >IT-NCS > >Mobile: 016- 3304503 > >Fixed: 03 - 7211595 >________________________ > >Priscilla Oppenheimer >http://www.priscilla.com ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=30988&t=30746 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
