Catalyst 3850 Cross-Stack EtherChannel

On 3850 configuration guide, I came across PAgP desirable mode is not supported in the switch stack (cross-stack EtherChannel).
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/layer2/configuration_guide/b_lay2_3se_3850_cg/b_lay2_3se_3850_cg_chapter_0101.html
But on Q&A document, it mentioned 3850 supports PAgP.
Q. What cross-stack EtherChannel link bundling protocols are supported?
A. The Cisco Catalyst 3850 supports Cisco Port Aggregation Protocol (PAgP) and industry-standard IEEE 802.3ad Link Aggregation Control Protocol (LACP). Other 3750 Series Switches support only LACP for cross-stack EtherChannel.
Seems like both statements are contradicting.
Can someone shed some light on this?
Thank you.

Hi, adimakmur
Cisco Catalyst 3850 Cross-Stack EtherChannel can be PAgP+ and can be used for VSS dual active detection.
In last deployment of 3850 we use Cross-Stack EtherChannel and use it as trusted for VSS dual active detection.
c6500-V#sh switch virtual dual-active pagp
PAgP dual-active detection enabled: Yes
PAgP dual-active version: 1.1
----skiped----
Channel group 106 dual-active detect capability w/nbrs
Dual-Active trusted group: Yes
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/7/7 Yes c3850-307 Te1/1/3 1.1
Te2/7/7 Yes c3850-307 Te2/1/3 1.1
---skiped----
c6500-V#sh etherchannel 106 protocol
Protocol: PAgP
c3850-307#sh etherchannel port-channel
Channel-group listing:
Group: 1
Port-channels in the group:
Port-channel: Po1
Age of the Port-channel = 235d:20h:50m:10s
Logical slot/port = 12/1 Number of ports = 2
GC = 0x00010001 HotStandBy port = null
Port state = Port-channel Ag-Inuse
Protocol = PAgP
Port security = Disabled
Ports in the Port-channel:
Index Load Port EC state No of bits
------+------+------+------------------+-----------
0 00 Te1/1/3 Desirable-Sl 0
0 00 Te2/1/3 Desirable-Sl 0
Time since last port bundled: 169d:04h:58m:49s Te1/1/3
Time since last port Un-bundled: 169d:05h:00m:47s Te1/1/3

Similar Messages

SG500 cross stack etherchannel

Is it possible to configure a cross stack etherchannel between 2 SG500 (in stack) and 1 SG200/SG300?

Hi all, I was wondering the exact same thing, I'm considering a similar design but doing an etherchannel between two cross-stacked SG500X and 3 UCS servers (C240 M3). Something like this:
|              |                                  |                 |
| UCS      |----------------------------------| SG500X    |
| C240     |                                 |__________|
| M3        |                                   __________
|              |                                  |                 |
|              |----------------------------------| SG500X    |
|________|                                  |__________|
I don't know if these switches could support this kine of cross stacked etherchannels, if it does then I'm guessing it's the same whether it's a server o a switch connected to it. Thanks in advance
Edit: Sorry for the ugly ascii drawing I just did on a whim...
El mensaje fue editado por: Eric A. Hernandez Gonzalez

Best way to migrate cross stack etherchannel mode "on" to "active"

Hey guys,
I've a cross stack etherchannel with mode on between two datacenters and now want to switch to LACP.
Can I just go into the physical interfaces and do a "no channel-group X mode on" -> "channel-group X mode active" or will I have to shut the ports down or completely remove the Port-Channel interface? Can't find any migration document around and don't have test equipment here. :(
Any ideas?
Thanks! :)

Sure, Switch-A:
Switch Ports Model SW Version SW Image
* 1 30 WS-C3750X-24 12.2(55)SE1 C3750E-UNIVERSALK9-M
2 30 WS-C3750X-24 12.2(55)SE1 C3750E-UNIVERSALK9-M
interface GigabitEthernet1/0/1
description X
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 18,60,64-66,68,100-102,104,105,200,251,900,902
switchport trunk allowed vlan add 903,906,911,934,937,939
switchport mode trunk
channel-group 2 mode active
end
interface GigabitEthernet2/0/3
description X
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 18,60,64-66,68,100-102,104,105,200,251,900,902
switchport trunk allowed vlan add 903,906,911,934,937,939
switchport mode trunk
channel-group 2 mode active
end
interface Port-channel2
description X
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 18,60,64-66,68,100-102,104,105,200,251,900,902
switchport trunk allowed vlan add 903,906,911,934,937,939
switchport mode trunk
end
Switch-B:
* 1 30 WS-C3750X-24 15.0(1)SE2 C3750E-UNIVERSALK9-M
2 30 WS-C3750X-24 15.0(1)SE2 C3750E-UNIVERSALK9-M
interface GigabitEthernet1/0/1
description Y
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 18,60,64-66,68,100-102,104,105,200,251,900,902
switchport trunk allowed vlan add 903,906,911,934,937,939
switchport mode trunk
channel-group 1 mode active
end
interface GigabitEthernet2/0/1
description Y
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 18,60,64-66,68,100-102,104,105,200,251,900,902
switchport trunk allowed vlan add 903,906,911,934,937,939
switchport mode trunk
channel-group 1 mode active
end
interface Port-channel1
description Y
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 18,60,64-66,68,100-102,104,105,200,251,900,902
switchport trunk allowed vlan add 903,906,911,934,937,939
switchport mode trunk
end

2960S Cross Stack Etherchannel Issues

We have a stack of 3 2960S's switches connected to a Cisco 3750X via a 4 port copper Etherchannel, intermittently the users are losing connection to the internet and with a host connected to the Master switch running a continuos ping to the 3750X pings are lost, we have replaced the Master switch and both GLC-T's. We also split the stack and had a single 1Gb connection to each switch from the core, we ran continuos pings from hosts on each switch and the only one to drop pings was the one on the Master switch. Versions and configs below, any thoughts ?
Version 3750X - 15.0(2) SE4
Version 2960S - 15.0(2) SE5
Port-Channel Config 3750X in attached file called 3750x
Port-Channel Config 2960S in attached file called 2960s
Also auto QoS has been enabled on both 3750X and 2960S.
Nothing appears in the logs on both switches.

Leo/Umesh,
Again thanks for the replies, I did a continous ping from a PC connected to the switch stack to an address on the Internet, I also had a continous ping going from another client on a different switch stack to the same internet address. The PC connected to the suspect switch stack dropped about 15 pings but the other PC was fine. I've now set up two syslog servers with the stack logging to one and the core to the other, also I've changed the stack master to be the middle switch which has no up links connected to it. Customer will start monitoring on Monday.

3750 Cross-stack equal cost routes across different switches in the stack

Hello,
If I configure a cross stack ethernet channel does it support link aggregation to increase bandwidth or is it just support for link failover?

Answer is support for link failover.
The EtherChannel on multiple switches in the Cisco Catalyst 3750 stack is called cross-stack EtherChannel.
If a link within an EtherChannel fails, traffic previously carried over that failed link changes to the remaining links
within the EtherChannel. A trap is sent for a failure, which identifies the switch, the EtherChannel, and the failed link.
Inbound broadcast and multicast packets on one link in an EtherChannel are blocked, and cannot return on any other link of the EtherChannel.
HTH
Regards
inayath

Catalyst 3850 Stack VLANs, layer 2 vs. layer 3 design question

Hello there:
Just a generic, design question, after doing much reading, I am just not clear as when to use one or the other, and what the benefits/tradeoffs are:
Should we configure the switch stack w/ layer 3, or layer 2 VLANs?
We have a Catalyst 3850 Stack, connected to an ASA-X 5545 firewall via 8GB etherchannel.
We have about 100 servers (some connected w/ bonding or mini-etherchannels), and 30 VLANs.
We have several 10GB connections to servers.
We push large, (up to) TB sized files from VLAN to VLAN, mostly using scp.
No ip phones, no POE.
Inter-VLAN connectivity/throughput and security are priorities.
Originally, we planned to use the ASA to filter connections between VLANs, and VACLs or PACLs on the switch stack to filter connections between hosts w/in the same VLAN.
Thank you.

If all of your servers are going to the 3850 then I'd say you've got the wrong switch model to do DC job. If you don't configure QoS properly, then your servers will start dropping packets because Catalyst switches have very, very shallow memory buffers. These memory buffers get swamped when servers do non-stop traffic.
Ideally, Cisco recommends the Nexus solution to connect servers to. One of the guys here, Joseph, regularly recommends the Catalyst 4500-X as a suitable (and financial) alternative to the more expensive Nexus range.
In a DC environment, if you have a lot of VM stuff, then stick with Layer 2. V-Motion and Layer 3 don't go hand-in-hand.

Disabling Catalyst 3850 Stack Discovery?

At Cisco Live! 2013 Orlando a mention was made which I understood to mean that by turning off the stacking ports of a Catalyst 3850 the switch would not wait for stack discovery but proceed with the boot sequence (by virtue of knowing the topology i.e. no other switches).
However, if I issue
switch 1 stack port 1 disable
switch 1 stack port 2 disable
save the config and do a reboot, the switch still sits for a long time just before the stack discovery completion messages, and boots no faster than a default out-of-the-box switch. Did I misunderstand, or is there some other command to tell the switch to not bother with stack discovery?

Here is a late reply:
It doesn't disable it completely:
When a stack port is flapping and causing instability in the stack, be careful when using the switch stack-member-number stack port port-number disable privileged EXEC command. When you disable the stack port, the stack operates at half bandwidth.

How many Cisco Catalyst 3850 switches can make up a Cisco StackPower stack?

I know the number of Cisco 3850 switches for stacking is 9, so, if I make up a Cisco StackPower stack, MAX is 9, too?

Hi, emma, only 4 switches can become part of the same Cisco StackPower stack in a ring topology.
For the Cisco 3850 switches stack number,there are two types:
Up to 9 Cisco Catalyst 3850 switches can be stacked together to build single logical StackWise-480 switch since Cisco IOS XE Release 3.3.0SE. Prior to Cisco IOS XE Release3.3.0SE, up to 4 Cisco Catalyst 3850 switches could be stacked together.

Catalyst 3850 Stack - 10G Modules

I have installed a (3) switch stack of Catalyst 3850 switches. I installed a 10G module in the 1st switch (the master) configured it and plugged it into the network and all works fine. Now I would like to add a second 10 Gigabit Ethernet connection to the stack in a channel group. When I install the 10G module into the standby switch (switch 3) I can do a "show inventory" and the 10G module is there. I can configure TenGigabitEthernet 3/1/3 and do a show run interface TenGigabitEthernet 3/1/3 all looks normal, but when I do a "show interface status" it is not listed and I cannot get the interface to come up. Is there anything I maybe missing when installing the 10G module or in my configurations?
Thanks!

Hello Martin,
As a reference, please look at this link, it may help you,
https://supportforums.cisco.com/docs/DOC-36084
Berta.
MARTIN HUERTER escribió:I have installed a (3) switch stack of Catalyst 3850 switches. I installed a 10G module in the 1st switch (the master) configured it and plugged it into the network and all works fine. Now I would like to add a second 10 Gigabit Ethernet connection to the stack in a channel group. When I install the 10G module into the standby switch (switch 3) I can do a "show inventory" and the 10G module is there. I can configure TenGigabitEthernet 3/1/3 and do a show run interface TenGigabitEthernet 3/1/3 all looks normal, but when I do a "show interface status" it is not listed and I cannot get the interface to come up. Is there anything I maybe missing when installing the 10G module or in my configurations?Thanks!

Problem Cisco Catalyst 3850 input errors

Ive installed two stacked Catalyst 3850s. Connected to these two switches I have a SAN 6210 Equallogic Dell ESX .
The interfaces on the switches is bundels with Port-channel. MTU size 9198. On swich one its no problem but on switch two I see input errors on these interface.
If I move the cables from switch two to one then its ok...
I have two 10G going to the SAN. And 4 ESX server with 2 ISCSI each.
interface Port-channel21
description ESX1 ISCSI SAN
switchport access vlan 21
switchport mode access
flowcontrol receive desired
spanning-tree portfast
spanning-tree bpduguard enable
Port-channel21 is up, line protocol is up (connected)
Hardware is EtherChannel, address is
Description: ESX1 ISCSI SAN
MTU 9198 bytes, BW 2000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 17/255, rxload 16/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is auto, media type is
input flow-control is off, output flow-control is unsupported
Members in this channel: Gi1/0/25 Gi1/0/34
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:07:12, output never, output hang never
Last clearing of "show interface" counters 1d21h
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 128760000 bits/sec, 8233 packets/sec
5 minute output rate 137021000 bits/sec, 7343 packets/sec
     520088013 packets input, 1454135312 bytes, 0 no buffer
     Received 1088 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     1534 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     564793180 packets output, 978716517 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

Hi and Sorry Just copied and past the part that I thought was the problem. It seems that MTU size on switch two in the stack still has MTU 1500......
So here is the lot....
This interface is OK
sh controllers ethernet-controller g1/0/25
Transmit                  GigabitEthernet1/0/25                 Receive
2373084674113 Total bytes               2700589618458 Total bytes
   1259517537 Unicast frames               1355829627 Unicast frames
2373055994149 Unicast bytes             2700589410330 Unicast bytes
       314726 Multicast frames                      0 Multicast frames
     25604588 Multicast bytes                       0 Multicast bytes
        44657 Broadcast frames                   3252 Broadcast frames
      3075376 Broadcast bytes                  208128 Broadcast bytes
            0 System FCS error frames               0 IpgViolation frames
            0 MacUnderrun frames                    0 MacOverrun frames
            0 Pause frames                          0 Pause frames
            0 Cos 0 Pause frames                    0 Cos 0 Pause frames
            0 Cos 1 Pause frames                    0 Cos 1 Pause frames
            0 Cos 2 Pause frames                    0 Cos 2 Pause frames
            0 Cos 3 Pause frames                    0 Cos 3 Pause frames
            0 Cos 4 Pause frames                    0 Cos 4 Pause frames
            0 Cos 5 Pause frames                    0 Cos 5 Pause frames
            0 Cos 6 Pause frames                    0 Cos 6 Pause frames
            0 Cos 7 Pause frames                    0 Cos 7 Pause frames
            0 Oam frames                            0 OamProcessed frames
            0 Oam frames                            0 OamDropped frames
       423237 Minimum size frames               78563 Minimum size frames
    593742624 65 to 127 byte frames         338414660 65 to 127 byte frames
      1416083 128 to 255 byte frames          4836098 128 to 255 byte frames
       558097 256 to 511 byte frames          1505992 256 to 511 byte frames
      5464138 512 to 1023 byte frames         6457219 512 to 1023 byte frames
    472854085 1024 to 1518 byte frames      834470341 1024 to 1518 byte frames
        80781 1519 to 2047 byte frames         257961 1519 to 2047 byte frames
      2891352 2048 to 4095 byte frames       13701476 2048 to 4095 byte frames
     14353508 4096 to 8191 byte frames        8698824 4096 to 8191 byte frames
    168093015 8192 to 16383 byte frames     147411745 8192 to 16383 byte frames
            0 16384 to 32767 byte frame             0 16384 to 32767 byte frame
            0 > 32768 byte frames                   0 > 32768 byte frames
            0 Late collision frames                 0 SymbolErr frames
            0 Excess Defer frames                   0 Collision fragments
            0 Good (1 coll) frames                  0 ValidUnderSize frames
            0 Good (>1 coll) frames                 0 InvalidOverSize frames
            0 Deferred frames                       0 ValidOverSize frames
            0 Gold frames dropped                   0 FcsErr frames
            0 Gold frames truncated
            0 Gold frames successful
            0 1 collision frames
            0 2 collision frames
            0 3 collision frames
            0 4 collision frames
            0 5 collision frames
            0 6 collision frames
            0 7 collision frames
            0 8 collision frames
            0 9 collision frames
            0 10 collision frames
            0 11 collision frames
            0 12 collision frames
            0 13 collision frames
            0 14 collision frames
            0 15 collision frames
            0 Excess collision frames
LAST UPDATE 4870 msecs AGO
This interface have problem. It is in portchannel with g1/0/25. Ive got more interfaces and port-channels showing the same behavior for switch two in my cluster.
sh controllers ethernet-controller g2/0/25
Transmit                  GigabitEthernet2/0/25                 Receive
925460044357 Total bytes                201085804055 Total bytes
    702370104 Unicast frames                184041790 Unicast frames
925449913241 Unicast bytes              201085599895 Unicast bytes
       118823 Multicast frames                      0 Multicast frames
      9171804 Multicast bytes                       0 Multicast bytes
        14251 Broadcast frames                   3190 Broadcast frames
       959312 Broadcast bytes                  204160 Broadcast bytes
            0 System FCS error frames               0 IpgViolation frames
            0 MacUnderrun frames                    0 MacOverrun frames
            0 Pause frames                          0 Pause frames
            0 Cos 0 Pause frames                    0 Cos 0 Pause frames
            0 Cos 1 Pause frames                    0 Cos 1 Pause frames
            0 Cos 2 Pause frames                    0 Cos 2 Pause frames
            0 Cos 3 Pause frames                    0 Cos 3 Pause frames
            0 Cos 4 Pause frames                    0 Cos 4 Pause frames
            0 Cos 5 Pause frames                    0 Cos 5 Pause frames
            0 Cos 6 Pause frames                    0 Cos 6 Pause frames
            0 Cos 7 Pause frames                    0 Cos 7 Pause frames
            0 Oam frames                            0 OamProcessed frames
            0 Oam frames                            0 OamDropped frames
       155980 Minimum size frames                3226 Minimum size frames
     92357460 65 to 127 byte frames          52503630 65 to 127 byte frames
       542363 128 to 255 byte frames           660137 128 to 255 byte frames
      1843346 256 to 511 byte frames           500600 256 to 511 byte frames
      6158096 512 to 1023 byte frames         1116353 512 to 1023 byte frames
    601445933 1024 to 1518 byte frames      129261034 1024 to 1518 byte frames
            0 1519 to 2047 byte frames         319527 1519 to 2047 byte frames
            0 2048 to 4095 byte frames              0 2048 to 4095 byte frames
            0 4096 to 8191 byte frames              0 4096 to 8191 byte frames
            0 8192 to 16383 byte frames             0 8192 to 16383 byte frames
            0 16384 to 32767 byte frame             0 16384 to 32767 byte frame
            0 > 32768 byte frames                   0 > 32768 byte frames
            0 Late collision frames                 0 SymbolErr frames
            0 Excess Defer frames                   0 Collision fragments
            0 Good (1 coll) frames                  0 ValidUnderSize frames
            0 Good (>1 coll) frames            319524 InvalidOverSize frames
            0 Deferred frames                       3 ValidOverSize frames
            0 Gold frames dropped                   0 FcsErr frames
            0 Gold frames truncated
            0 Gold frames successful
            0 1 collision frames
            0 2 collision frames
            0 3 collision frames
            0 4 collision frames
            0 5 collision frames
            0 6 collision frames
            0 7 collision frames
            0 8 collision frames
            0 9 collision frames
            0 10 collision frames
            0 11 collision frames
            0 12 collision frames
            0 13 collision frames
            0 14 collision frames
            0 15 collision frames
            0 Excess collision frames

Converged Access Design Help (Catalyst 3850 and WLC 5508...Mobility Oracle)

Hello,
I am an engineer working with a Cisco Gold Partner in Saudi Arabia. We have a large university as our client where they are constructing a new
building and require our services to build the network infrastructure. Therefore, we are to implement the routing and switching infrastructure as
well as the Wireless solution.
At present, I have no issues in implementing the R&S infrastructure as it is very straight forward but it has implications on the deployment of
the wireless solution which I explain further below. The R&S infrastructure comprises of the typical Core, Distribution, and Access layers and we
are focusing on the local distribution and access switches with regards to the new building. The client has a converged Layer 3 network spanning
from distribution layer to core layer and they are running EIGRP for this convergence. This is not a problem and has already been implemented.
Yet, the challenge arises in deploying the WLAN infrastructure. The client already has a Cisco WLAN infrastructure in place where they have a
large number of LAPs that are registered with their controllers in the Data Center. They have two WLC 5508 where one is the Primary and the other
the Secondary. The local distribution switch to which the WLC are connected also is the gateway for the SVIs for the SSIDs that are configured on
the controllers. This means that once the packets from the AP come in to the WLC, they are tagged with the correct VLAN and sent to the directly
connected distribution switch which then routes it into the rest of the Layer 3 network. Interestingly, the WLC 5508 are running AireOS 7.6 and
support the "New Mobility" feature. The two controllers have formed a Mobility Group (MG) between each other.
Now, the new building will have two Catalyst 3850 switches installed where each one has a total of 40 AP licenses pre-installed and activated
i.e. a total of 80 APs can be supported by the two switches. A total of 67 LAPs will be deployed in the new building which can be accommodated
between the two switches and their integrated controller.
Yet, based on my understanding and research about Converged Access is that, ideally, the Catalyst 3850 will only run the Mobility Agent (MA)
feature while a central controller would provide the Mobility Controller (MC) service. unfortunately, there are not enough licenses on the
existing WLC 5508 nor can we migrate the new licenses that will facilitate such a split deployment.
This means that I would need to configure the two Catalyst 3850 as independent MC and form a MG between them. I have done this and tested this
already and the mobility is working fine. But my concern is not about getting the Catalyst 3850 to work as this is simple but rather it is
focused on creating a common Mobility Domain (MD) so that clients can roam from this new building to the rest of the campus while maintaining the
state of their connections to the WLAN infrastructure.
To make things more complicated, since the new building will have its own Layer 3 distribution switch and the Catalyst 3850 switches will connect
to this distribution switch, it means that new VLANs and SVIs need to be created for the SSIDs broadcast in the new building. This means that new
subnets need to be assigned to the SSIDs.
As such, I have the following questions:
Q1) If we create new SVIs for the SSIDs (same SSIDs names will be used in the new building as in the rest of the university campus) this means
that new subnets will be assigned to these SSIDs. Now, I believe I have two options...one is to make the new Catalyst 3850s to be in the same MG
as the existing WLC 5508 which then cater for Layer 3 client roaming or I have to treat this as a totally seperate WLAN network and follow on to
the solution as per the next question. Please advise which is a better option?
Q2) I could create separate MG i.e. the new building Catalyst 3850s can be in one MG and the existing controllers can be in another MG. I can
then have one of the existing WLC 5508 (the primary one) to run the Mobility Oracle (MO) feature so as to create a single Mobility Domain (MD).
Would this facilitate in Layer 3 client roaming and RRM for all the controllers in the same MD?
Q3) If I do create a MD, how is this accomplished in such an environment since the documentation is severely limited in this regard?
Please advise at your earliest. To assist further, I have attached a topology diagram which may aid in explaining the situation with more
clarity. If these things are clarified, I will be better able to wrap my head around the technology and in turn service my clients better.
Regards,
Amir

Hi Amir,
Q1) If we create new SVIs for the SSIDs (same SSIDs names will be used in the new building as in the rest of the university campus) this means that new subnets will be assigned to these SSIDs. Now, I believe I have two options...one is to make the new Catalyst 3850s to be in the same MG as the existing WLC 5508 which then cater for Layer 3 client roaming or I have to treat this as a totally seperate WLAN network and follow on to the solution as per the next question. Please advise which is a better option?
I would configure them in the same mobility group. Also configure same SPG for those two 3850 stacks if users are frequently roaming within these two buildings.
Q2) I could create separate MG i.e. the new building Catalyst 3850s can be in one MG and the existing controllers can be in another MG. I can then have one of the existing WLC 5508 (the primary one) to run the Mobility Oracle (MO) feature so as to create a single Mobility Domain (MD). Would this facilitate in Layer 3 client roaming and RRM for all the controllers in the same MD?
MO is not required (it is only for very large scale deployments)
Q3) If I do create a MD, how is this accomplished in such an environment since the documentation is severely limited in this regard?
Yes, documents are hard to find :(
These notes may be useful to you based on my experience. I am running IOS-XE 3.6.1 in my production.
http://mrncciew.com/2014/05/06/configuring-new-mobility/
http://mrncciew.com/2013/12/14/3850ma-with-5760mc/
HTH
Rasika
*** Pls rate all useful responses ****

Cisco Catalyst 3850 as ntp master

Hi All,
I have 2 x Cisco Catalyst 3850 stacked together. What are your recommendations if I use the C3850 as a ntp master for all edge switches connected in my network? All edge switches must be authenticated if it needs NTP sychronization. But other than that, what are the downsides?
For example,
1. I heard that switches do not have an internal clock so is a poor device to be a centralized NTP master.
2. I have also read that switches also have slow CPU processors that may lack the processing required.
3. Its NTP sychronization will use external NTP servers which are resolved into IP addresses (e.g. pool.ntp.org). IP address can change. What other more reliable NTP sources are there?
4. Any other thoughts and comments are most welcome.

Firstly, DO NOT use the command "ntp master". Cisco do not recommend using this commands because this will confuse the NTP propagation inside the network.
Next, all Cisco devices do not have a dedicated clock. All appliances need to get SNTP/NTP time synch from somewhere. This "somewhere" could either be a dedicated GPS-based NTP server and/or a time synch somewhere out in the internet.
You can also use the command "ntp update-calendar". This new command allows appliances to take regular "snapshot" of the time and save it into the NVRAM. In case there was a reboot or a power failure, the appliance's time is not too far away instead of waiting 5 to 10 minutes for SNTP/NTP to synch.

Cisco 3850 Power Stack

Hi
We recently purchased four Cisco 3850 switches (WS-C3850-48P-S) which comes with 715WAC power supply. We have also purchased additional four 1100WAC power supplies.
Our requirements are:
Configure four switches in stack
Use power stack feature
All 192 ports in Stack should be POE enabled
Questions:
Can we use both 715WAC and 1100WAC power supplies in same switch
Can we have all ports POE enabled with having both 715WAC and 1100WAC power supplie
Thanks
Muhammad Ibrahim

Hi,
See this information below:
24-Port PoE Switch
48-Port PoE Switch
PoE on all ports (15.4W per port)
One PWR-C1-715WAC
One PWR-C1-1100WAC or two PWR-C1-715WAC
PoE+ on all ports (30W per port)
One PWR-C1-1100WAC or two PWR-C1-715WAC
Two PWR-C1-1100WAC or one PWR-C1-1100WAC and one PWR-C1-715WAC
http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3850-series-switches/data_sheet_c78-720918.html
Hope this helps.

Looking for Cisco 3850 power-stack OID

Hi all,
Does anyone know the OID for the Powerstack interfaces of the Cisco 3850?
It is not the normal ifentry like the data-stacking cables!
Thanks
Willem

Hi,
See this information below:
24-Port PoE Switch
48-Port PoE Switch
PoE on all ports (15.4W per port)
One PWR-C1-715WAC
One PWR-C1-1100WAC or two PWR-C1-715WAC
PoE+ on all ports (30W per port)
One PWR-C1-1100WAC or two PWR-C1-715WAC
Two PWR-C1-1100WAC or one PWR-C1-1100WAC and one PWR-C1-715WAC
http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3850-series-switches/data_sheet_c78-720918.html
Hope this helps.

3750G Stack & Etherchannels

How many Etherchannels can a Full 9 stack of 3750G's support ?
Currently I have 8 gigabit Etherchannel uplinks in cross-stack.

Hi,
The number of EtherChannels is limited to 48.
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_55_se/configuration/guide/scg3750/swethchl.html#wp1275881
Hope this helps and remember to rate useful posts.
Leo

Catalyst 3850 Cross-Stack EtherChannel

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