We just had a failure of our Core Switches (Cisco 3750 - stacked).  Fortunately we had already purchased 3850's with the necessary stacking cables.  We were also able to pull the configuration off the Core from the 2nd member.   I have the two 3850's in the rack, and the Stacking Cables connected (Port 1 to 2, and 2 to 1).  The stack is coming up, both are at "ready" state, and redundancy is at Active and Standby "HOT).   The issue however is that the Switch Ports are only active on Switch 1 (Active).  Anything plugged into TenGigabitEthernet 1/0/1 -> 1/0/24 works fine. Anything plugged into 2/0/1 -> 2/0/24 does not.  There are no link lights, etc.  It is almost like the 2nd switch is just "mirroring" the 1st switch (port 1/0/1 to 24) instead of seeing both banks of switch ports.   In our old Core Switch, we had devices plugged into Switch 1 and Switch 2.  We want the same configuration here. What am I missing?   Priority is set (15 on Switch 1, and 10 on Switch 2).   ... View more

I have read some of the other posts, but cannot seem to find the reason for some Windows Hosts flapping on Port Channel.   We have a brand new Cisco Switch (WS-C3650-48PS) running Cat3K_caa_universalk9 03.06.06.E.  The We have a few Windows Hosts plugged in - all of which are Windows 2012 R2.   NIC Teaming is enabled on the Windows Hosts, and is set to LACP/Dynamic.   Example of a Port Channel setup: interface Port-channel110  switchport access vlan 10  switchport mode access  lacp max-bundle 2   The switch ports assigned to this port channel: interface GigabitEthernet1/0/7  switchport access vlan 10  switchport mode access  channel-protocol lacp  channel-group 110 mode active  spanning-tree portfast  spanning-tree bpdufilter enable ! interface GigabitEthernet1/0/8  switchport access vlan 10  switchport mode access  channel-protocol lacp  channel-group 110 mode active  spanning-tree portfast  spanning-tree bpdufilter enable   The Host MAC address for the Teamed Adapters, will regularly (at least once a week) generate a flapping error to our Network Monitoring Software.  The Host will flap between Port Channel 1, and the Channel above.   Port Channel 1 is the connection from this Switch to the Core Switch (3750).  Here is the configuration of the ports in this Channel: interface GigabitEthernet1/0/1  description ***Server Backbone - to Core - Trunk***  switchport trunk allowed vlan 10  switchport mode trunk  switchport nonegotiate  channel-group 1 mode on ! interface GigabitEthernet1/0/2  description ***Server Backbone - to Core - Trunk***  switchport trunk allowed vlan 10  switchport mode trunk  switchport nonegotiate  channel-group 1 mode on   I can verify that the Host in question (and in fact all hosts on this switch) are only plugged into this switch for VLAN 10 Access.   We are also having issues with this particular Switch - it will stop responding to its VLAN 10 IP Address (monitoring software will lose connectivity) - it has also rebooted itself a couple of times, so we may also be dealing with a Hardware issue. At any rate, I would like to clear the flapping issue first, to see if it resolves some of the other things we are seeing.   ... View more

Looking for some assistance on an issue we are seeing with a Cisco C3560X.  All of our branch switches have the same configuration, however this particular Branch Switch is generating an alert in Solarwinds, with a high number of Discards.  I believe Discards in SW relate to show interface value -> Total Output Drops (I believe anyway). Running 15.0(2) SE8 UniversalK9-M Here is the configuration of a sample standard access port: interface GigabitEthernet0/5  description ****Standard Access Port****  switchport access vlan 10  switchport mode access  switchport voice vlan 11  no logging event link-status  srr-queue bandwidth share 1 70 25 5  srr-queue bandwidth shape 30 0 0 0  priority-queue out  no snmp trap link-status  mls qos trust dscp  storm-control broadcast level 15.00  storm-control action shutdown  no cdp enable  no lldp transmit  no lldp receive  spanning-tree portfast Here is the show interface for this port: show interface gigabitEthernet 0/5 GigabitEthernet0/5 is up, line protocol is up (connected)   Hardware is Gigabit Ethernet, address is 6c99.89e7.9105 (bia 6c99.89e7.9105)   Description: ****Standard Access Port****   MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,      reliability 255/255, txload 1/255, rxload 1/255   Encapsulation ARPA, loopback not set   Keepalive set (10 sec)   Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX   input flow-control is off, output flow-control is unsupported   ARP type: ARPA, ARP Timeout 04:00:00   Last input never, output 00:00:07, output hang never   Last clearing of "show interface" counters 1d00h   Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 7844280   Queueing strategy: fifo   Output queue: 0/40 (size/max)   5 minute input rate 89000 bits/sec, 50 packets/sec   5 minute output rate 239000 bits/sec, 141 packets/sec      145793 packets input, 30710632 bytes, 0 no buffer      Received 810 broadcasts (423 multicasts)      0 runts, 0 giants, 0 throttles      0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored      0 watchdog, 423 multicast, 0 pause input      0 input packets with dribble condition detected      4038005 packets output, 428508100 bytes, 0 underruns      0 output errors, 0 collisions, 0 interface resets      0 unknown protocol drops      0 babbles, 0 late collision, 0 deferred      0 lost carrier, 0 no carrier, 0 pause output      0 output buffer failures, 0 output buffers swapped out I have highlighted the total output drops, as I believe that is generating the Alert.  It is also crazy high, compared to any of our other switches. Should also note we are using this configuration everywhere, and it works fine at other locations, with the same type of devices plugged in.  Here is an example of another Branch Office, and what its traffic looks like: show interface gigabitEthernet 0/3 GigabitEthernet0/3 is up, line protocol is up (connected)   Hardware is Gigabit Ethernet, address is ccd8.c16d.2d03 (bia ccd8.c16d.2d03)   Description: ****Standard Access Port****   MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,      reliability 255/255, txload 1/255, rxload 1/255   Encapsulation ARPA, loopback not set   Keepalive set (10 sec)   Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX   input flow-control is off, output flow-control is unsupported   ARP type: ARPA, ARP Timeout 04:00:00   Last input never, output 00:00:04, output hang never   Last clearing of "show interface" counters never   Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0   Queueing strategy: fifo   Output queue: 0/40 (size/max)   5 minute input rate 2000 bits/sec, 3 packets/sec   5 minute output rate 2000 bits/sec, 3 packets/sec      2220922 packets input, 181965988 bytes, 0 no buffer      Received 242314 broadcasts (0 multicasts)      0 runts, 0 giants, 0 throttles      0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored      0 watchdog, 0 multicast, 0 pause input      0 input packets with dribble condition detected      13828206 packets output, 1348934099 bytes, 0 underruns      0 output errors, 0 collisions, 1 interface resets      0 unknown protocol drops      0 babbles, 0 late collision, 0 deferred      0 lost carrier, 0 no carrier, 0 pause output      0 output buffer failures, 0 output buffers swapped out These switches are the same model, running the same IOS version - pretty much identical in every way, accept for the Physical Location.  Any thoughts on why I am seeing such an issue? ... View more

Please excuse my ignorance, but I am following up on a wireless setup that was implemented by a 3rd party - so my understanding of Cisco Wireless is low. Current setup - 2 x Cisco 2100 Wireless Controllers, managing 4 Access Points each.  These Access Points are at head office, and at our branch locations. Guest Access is being provided using the LobbyAdmin account.  Reception creates the account.  We are using the default Cisco Authentication page 1.1.1.1, etc. Issue - Reception was trained to create the accounts on Controller #1 - it was thought that accounts created on #1, would be accessible anywhere in our network.  What we have found however is that only AP's being managed by Controller #1 will be able to use the Guest ID.  If the AP is on Controller #2 - the Guest ID does not exist.   I am thinking that we are missing something simple in the setup - but is there a way to make the Guest ID's - for lack of a better word - Global?  (Hopefully a simple way as well). Until we find something, will change the way Reception creates the accounts. ... View more

Not sure if I am using the correct terminology, but I am investigating setting up a HA server backbone. Here is our current setup: 2 x Cisco 3560 Switches. Connected to a ganged 3750 at the core. Each of the Server Room Switches is essentially independant. They each have their own LAN port to the core, etc. What I would like to do however is: Since all our Servers have dual NIC ports - Connect NIC 1 to Server Switch 1, and NIC 2 to Server Switch 2 - load balancing (would that work). Make Server Room Switch 1 redundant to Switch 2, and vice versa. Redundant connections to the Core No reduction in throughput/speed. This may be a little complicated for me to setup, but I would appreciate if anyone can share their knowledge/configs. ... View more

Hi Everyone, Current setup for our Server Room: 1) Cisco Catalyst 3560G 48 Switch 2)1 Trunk port to the Core 3) Rest of the ports simple access ports to the servers All of our Servers are Dell, with dual NICs as part of the order.  This year, we were able to purchase another Cisco 3560G, with the idea of making our Backbone to the servers Redundant. I have some ideas on how to do this, but wanted to bounce them off the experts, as I am by no means a Cisco professional. Thoughts were as follows. 1) 2 Trunk Ports on each Switch to the Core (Can we bind them together for better throughput?) 2) 1 Trunk Port on each switch, to it neighbour (Backbone). That should give me High Availability correct? Then each Server - Nic 1 to Switch 1, Nic 2 to Switch 2 (Backbone) I can make them standard Access ports, but I was wondering if there was a better way to do this. I.E. rather then have one NIC in standby, can I link the ports that go to each server together, both for better performance, and redundancy?  I am thinking that if the switch ports are standard access, and I plug both NICs in I may have problems. Dell NICs are either Intel, or Broadcom. Any help would be great. ... View more