Hello,   The 3850 is not EOL at this time. You can look at all EOL notices for the 3850 here:   https://www.cisco.com/c/en/us/products/switches/catalyst-3850-series-switches/eos-eol-notice-listing.html   Usually we will publish an EOL notice a couple years ahead of time to give you time to migrate to a supported platfrom before the actual EOL date. There is not even an EOL notice for the platform out yet. Just certain versions of software.   Hope that helps! ... View more

Hello,   You are probably hitting one of the issues that Utkarsh mentioned:   https://bst.cloudapps.cisco.com/bugsearch/bug/CSCuz57493/   It is not fixed until 3.6.6. I believe 3.6.10 is out if you want to stay on the same train or move to the recommended code of 16.6.5. I would upgrade this device when you get a chance.   Hope that helps! ... View more

Hello James,   Are the source and receiver in the same vlan? You only want one  querier in a vlan. You should remove it from all the L2 switches and leave it on the 3850.   Hope that helps!! ... View more

Hello James,   Are the 2960s L2 only? If so, they don't need the PIM config. Also, you only want one  querier in a vlan and enabling PIM on an interface enables it as a querier so you can remove "ip igmp snooping querier" from all switches as "ip pim sparse-mode" automatically enables it for you.    The clients and the source server are both in vlan 18? I assume unicast from the source server to the clients work?   Hope that helps! ... View more

Hello,   As Mark mentioned, this is possible. You can also use a dash to specify a range:   vlan 50-60   The above command will create vlans 50 through 60 in one command.   Hope that helps! ... View more

Hello,   It would depend on the size of the packet. You are not going to be able to hold as many 1500 byte packets as you would 200 byte packets. Take the size of the buffer (4MB) and divide it by your average packet size and that should give you a rough idea of how many packets.   Hope that helps! ... View more

Hello,   You do not have any drops on your control-plane. You will need to follow the path of the packet and check for interface drops, maybe do some SPAN captures to determine which device is causing the drops.    Hope that helps! ... View more

Hello,   Unfortunately, my simulator doesn't have the  switchport mode private-vlan trunk promiscuous command. Just switchport mode private-vlan promiscuous so I can't validate the config 100%. However, it seems like it should work. Might be worth opening a support ticket if you have support.   Hope that helps! ... View more

Hello,   Usually that is an indication that spanning-tree is unstable. Whenever you get a spanning-tree TCN, you will flush your mac table. If you were flushing your mac table over and over, it might seem like you were not learning macs when really you were learning macs just flushing them right away.    There is no command that I know of to check mac flaps, they should just be logged to your log if you have it set to the right level. You might have to enable mac address flaps logging.   mac address-table notification mac-move mac address-table notification change   Unfortunately, this won't help you now since the event has passed but you might want to enable these in case it happens again.    Hope that helps! ... View more

Hello Muhammad,   Thanks for the info. Did you see anything in your log at the time (show log)? Any issues with spanning-tree (show spanning-tree detail)?   Thanks! ... View more

Hello,   I put your setup into a sim (see attached) and it worked for me. I put iosv-1 and iosv-2 into HSRP with each other. I configured the ports connected to these as  promiscuous ports. I configured the ports between iosvl2-1 and iosvl2-2 as a normal trunk. I think put gig1/1 on these ports as isolated host ports. I used iosv-3 and iosv-5 to simulate hosts. When I did this, each host could ping both routers but could not ping each other.    Is it possible to share your configuration? Thanks! ... View more