Span port channel

Hi All,
Is there any option to span port channel of Cisco 6500 Switch.If possible What is the configuration for the same..
Pls help..
Regards,
Ajith

Hi,
You can, but the Portchannel has to be in on mode. You cannot use it wilt LACP or PAGP.
Note:
From Cisco IOS Software Release 12.2(33)SXH and later, PortChannel interface can be a destination port. Destination EtherChannels do not support the Port Aggregation Control Protocol (PAgP) or Link Aggregation Control Protocol (LACP) EtherChannel protocols; only the on mode is supported, with all EtherChannel protocol support disabled.
http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008015c612.shtml
HTH
Reza

Similar Messages

Do I configure spanning-tree port type ed trunk on LACP port-channels

Hello,
Can't seem to see a clear answer and wondering if something could offer some advice please?
We are using LACP aggregation across all our 10 gig attached servers and also trunking them. We're running a VPC pair of 5596 Nexus.
For a standard trunk port I always add the spanning-tree port type edge trunk to the interface config.
However I think I should be adding this to the overiding port-channel config. At present a colleague has configured the VPC below omitting the spanning-tree port type config.
interface port-channel100
description a-server
switchport mode trunk
switchport trunk allowed vlan 100
vpc 100
The port member configs are these which do contain the spanning tree port type:
interface Ethernet1/1
description a-server(1)
switchport mode trunk
switchport trunk allowed vlan 100
spanning-tree port type edge trunk
channel-group 100 mode active
I always try to keep the overiding port channel config the same as its members and obviously for most config, you can't have disparate configs anyway.
However for the spanning tree config the NexOS allows you to have the members with spanning tree port types and not have to reflect that in the port-channel.
However I have this issue with STP:
Switch1# show spanning-tree interface po100
Vlan Role Sts Cost Prio.Nbr Type
VLAN0100 Desg BKN*200 128.4996 (vPC) Network P2p *BA_Inc
Is this due to the inconsistency with my port channel to member configs?
Any advice would be gratefully accepted.
Thanks!

Hi Paul, there are some parameters you can define on individual ports and there are some of them that will be inherited from the port-channel configuration no matter what has been configured under the infidividual ports. Spanning-tree configuration is one of the inherited ones. As soon as the port joins into a port-channel, it will start to use spanning-tree settings under the port-channel. When it leaves the channel, then it can continue to use the individual configuration.
There is a nice summary here under NX-OS Interface Conf Guide > Port-Channel Conf:
http://www.cisco.com/en/US/docs/switches/datacenter/sw/6_x/nx-os/interfaces/configuration/guide/if_portchannel.html#wp1798338
Evren

How to configure a port channel with VLAN trunking (and make it work..)

We're trying to configure a port channel group with trunked ports to connect a NetApp HA pair. We want to create two data LIFs and connect them to the switch stack. We are trying to create 2 data lifs, one for cifs and one for nfs that are on different vlans.
We want the same ports to be able to allow multiple vlans to communicate. (trunked)
These data lifs should be able to fail over to different nodes in the HA pair and still be able to communicate on the network.
What this means is that we have to connect 4 ports each for each node in the NetApp HA Pair to the switches and create a port channel of some type that allows for trunked vlans. When we configure the ports, the configuration is as follows (below):
We are only able to configure an IP on one of the vlans.
When we configure an IP from another vlan for the data lif, it does not respond to a ping.
Does anyone have any idea what I'm doing wrong on the Cisco switch?
interface GigabitEthernet4/0/12
description Netapp2-e0a
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 10,20,511,519
channel-protocol lacp
channel-group 20 mode active
end
interface GigabitEthernet4/0/13
description Netapp2-e0c
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 10,20,511,519
channel-protocol lacp
channel-group 20 mode active
end
interface GigabitEthernet6/0/12
description Netapp2-e0b
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 10,20,511,519
channel-protocol lacp
channel-group 20 mode active
end
interface GigabitEthernet6/0/13
description Netapp2-e0d
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 10,20,511,519
channel-protocol lacp
channel-group 20 mode active
end
interface Port-channel20
description Netapp2-NFS
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 10,20,511,519
spanning-tree portfast
spanning-tree bpduguard enable
end

Our problem was fixed by the storage people. They changed the server end to trunk, and the encapsulation / etherchannel.
I like all the suggestions, and they probably helped out with the configuration getting this to work.
Thanks!
interface Port-channel20
description Netapp2-NFS
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 10,20,511,519
switchport mode trunk
interface GigabitEthernet4/0/12
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 10,20,511,519
switchport mode trunk
channel-protocol lacp
channel-group 20 mode active
interface GigabitEthernet4/0/13
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 10,20,511,519
switchport mode trunk
channel-protocol lacp
channel-group 20 mode active
interface GigabitEthernet6/0/12
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 10,20,511,519
switchport mode trunk
channel-protocol lacp
channel-group 20 mode active
interface GigabitEthernet6/0/13
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 10,20,511,519
switchport mode trunk
channel-protocol lacp
channel-group 20 mode active

Nexus 7010 port-channel to ESXi host running on Dell 910 and 810

Was wondering has anyone had any experience with configuring a port-channel going back to ESXi host. My basic config is below. My issue is with what to put in the spanning-tree port type. Do I use normal, edge, network, or edge trunk?? Yes I have read most of the documentation out there but am just a lil confused. I just wanna be right.
Also if anyone has any suggestions for the Vswitch config as well that would be much appreciated.
int PO 201
desc 01_6-1
switchport mode trunk
switchport access vlan 99
switchport trunk native vlan 777
switchport trunk allowed vlan 220,300,310,320-321,350,390-391
switchport trunk allowed vlan add 420,777
spanning-tree port type normal (what should go here)
speed auto
medium p2p
no shutdown
int e8/11
desc 01_6-1
channel-group 201 force
int e10/11
desc 01_6-1
channel-group 201 force
Thanks Guys

Short answer: You could use spanning tree port type edge (trunk; if it's going to be a trunk). The vswitch isn't really a switch, it doesn't participate in spanning tree, so it's fine to make it an edge port.
In my experience, many VMware guys don't like port channels as much as the other more host-centric NIC teaming methods. I think this has to do with ESX having a less than stellar implementation of etherchannel/LACP early on.

Port Channels - WLC 5508 and 4510

LACP and PAgP are not supported on the controller and it appears that the 4500 series will not use LAG.
interface Port-channel10
description WLC Port-Channel
switchport
switchport mode trunk
service-policy input AutoQos-4.0-Input-Policy
service-policy output OUTPUT-PRIORITY-POLICING-ETHERCHANNEL
interface GigabitEthernet3/1
description Cisco 5508 Wireless Controller
switchport mode trunk
channel-group 10 mode active
spanning-tree link-type point-to-point
interface GigabitEthernet3/2
description Cisco 5508 Wireless Controller
switchport mode trunk
channel-group 10 mode active
spanning-tree link-type point-to-point
I am getting the error, "lacp not enabled on remote port..". I removed the 2nd fiber cable and removed the channel-group so I could get the WLC back online. Any help would be greatly appreciated.

In order to get the ether channel to work with the WLC you need to change your configuration from:
interface GigabitEthernet3/1
channel-group 10 mode active
interface GigabitEthernet3/2
channel-group 10 mode active
To mode ON
interface GigabitEthernet3/1
channel-group 10 mode on
interface GigabitEthernet3/2
channel-group 10 mode on
Mode ON tells the switch to do Link Aggregation Protocol and does try and negotiate using one of the two control protocols LACP or PAgP.
using mode ON is part of the configuration guide when enabling Cisco WLC LAG option.

About n1000v with port channel

there is a n1000v connected to multiple upstream switches in the customer's production environment.
the following is from the Cisco Nexus 1000V Interface Configuration Guide, Release4.2(1)SV2(2.1).
You use vPC-HM mode to create a port channel when the switch is connected to multiple upstream switches
that are not clustered.
my question is,
can I use LACP with multiple upstream switches that are not clustered?
can I use LACP with multiple upstream switches that are stacked?
if I stack multiple upstream switches,does it mean clustered?
thanks.

Hi,
See some of the guidelines:
Guidelines and Limitations
Port channeling has the following guidelines and restrictions:
•All ports in the port channel must be in the same Cisco Nexus 1000V module; you cannot configure port channels across Cisco Nexus 1000V modules.
•Port channels can be formed with multiple upstream links only when they satisfy the compatibility requirements and under the following conditions:
–The uplinks from the host are going to the same upstream switch.
–The uplinks from the host going to multiple upstream switches are configured with vPC-HM.
•You can configure multiple port channels on a device.
•After you configure a port channel, the configuration that you apply to the port channel interface affects the port channel member ports. The configuration that you apply to the member ports affects only the member port where you apply the configuration.
•You must remove the port security information from a port before you can add that port to a port channel. Similarly, you cannot apply the port security configuration to a port that is a member of a channel group.
•You can configure ports that belong to a port channel group as PVLAN ports.
•Any configuration changes that you apply to the port channel is applied to every member interface of that port channel.
•Channel member ports cannot be a source or destination SPAN port.
That said LACP should work on switches that are not clustered and meet the conditions above.
A stack is treated as one unit which means that would be like you have just one big chassis.
Stacking does not the same as clustering it works different. so if you stack them that would be a stack not a cluster
http://www.cisco.com/en/US/docs/switches/datacenter/nexus1000/sw/4_2_1_s_v_1_4/interface/configuration/guide/n1000v_if_5portchannel.html#wp1270746
Hope this helps.

How to troubleshooting port channel in N7K

i find N5K
http://www.cisco.com/c/en/us/support/docs/switches/nexus-5000-series-switches/116199-technote-stp-00.html
i notice distribution switch has root guard block log
does it mean that looping has occured yesterday?
i use command below do not have yesterday record
show spanning-tree internal event-history tree 1 brief | in "2015:03:15 10"
first core is root switch
now port channel shutdown in first core and use port channel in second core. How can i see which problem has occurred in port channel ?
how to know which port has problem ?
how to know which vlan caused the problem ?
we notice one of access switch has lost config, will it affect the distribution layer switch?
i remember that yesterday i just get log with filezilla after configure notebook same vlan and same network with the testing access switch

Not sure if youre after the portchannel bandwidth or port-channel speed... If you really want to get an insight on the bandwidth usage, get SNMP on both sides, actively monitor the port channel and interfaces (real time by frequent polling)
And you could get two endpoints @ 10 gb nics that are bundled, then 'thrash' the link, end to end. I use iperf, you could use big ftp transfers to test and see what performance is. You'll get the rate / speed in which the links are operating 'end to end'
It may mean that the ports are @10gb full duplex, but the overall bandwidth is 20gb
Sent from Cisco Technical Support iPhone App

VSS port channel options

Hi,
I am converting 2 6500 chassis to VSS, currently they are configured as primary & backup. Downstream switch have 4 uplinks, 2 to each chassis with port channels. After I convert to VSS I will have all 4 ports connecting to downstream switch in a port channel, can I keep 2 separate port channels on downstream switch or will it cause issues ?
thanks
hasrat

Hi Hazrat,
I agree with Reza. By the way what is at your mind in keeping 2 seperate port-channels to one device?(please note after VSS logically it is one switch). One of the Port-channel will not be used at all since spanning tree will block it. So as Reza said bundle them in all one.
Thanks,
Madhu

Nexus 9k span port

Can someone provide instructions of how to configure a span port/monitor session on a 9k?

Hi Joris,
SPAN source functionality on satellite ports and host interface port channels is not supported when the FEX is connected to F2 Series modules. Beginning with Cisco NX-OS Release 6.2(2), FEX ports are supported as an egress SPAN source on F2e Series modules.
http://www.cisco.com/en/US/docs/switches/datacenter/sw/6_x/nx-os/system_management/configuration/guide/sm_14span.html#wp1239670
Nexus7k# show module
Mod Ports Module-Type                         Model              Status
1    0      Supervisor module                 N7K-SUP2           active *
3    48     1/10 Gbps Ethernet Module           N7K-F248XP-25      ok
Mod Sw              Hw
1    6.x(x)          1.0
3    6.x(x)          1.1
Mod MAC-Address(es)                         Serial-Num
1    84-xx-xxx to 84-xx-xxxx JAxxxxxxxx
3    00-xxx to 00-xxxxx JAxxxxxxx
Mod Online Diag Status
1    Pass
3    Pass
* this terminal session
Regards
Jens

IOS to NXOS VPC PORT CHANNEL

Hello
I have a pair of Nexus 5K's in a VPC domain and some 2960's as VPC members, with a port channel to the domain.
Topology is as follows:
5K1 and 5K2 in VPC domain
VPC from 5K1 and 5K2 to 2960
2960 has gi0/1 and gi0/2 in 1 port channel
gi0/1 to 5k1, gi0/2 to 5k2
I know that what I am going to ask may be totally against the purpose of VPC, but, I am looking for a way to favour gi0/1 for traffic, rather than load balancing over gi0/1 and gi0/2. The reaon for this is that I would like to benefit from the lack of loop that VPC provides, but would also like to have a primary and secondary link as the majority of traffic should actually go via 5K1, rather than 5K2.
Any suggestions welcome.
Many thanks in advance
Anthony

Hi Anthony,
The Cisco NX-OS software load balances traffic across all operational interfaces in a portchannel by hashing the addresses in the frame to a numerical value that selects one of the links in the channel. Port channels provide load balancing by default. Port-channel load-balancing uses MAC addresses, IP addresses, or Layer 4 port numbers to select the link. Port-channel load balancing uses either source or destination addresses or ports, or both source and destination addresses or ports.
You can configure the load-balancing mode to apply to all port channels that are configured on the entire device or on specified modules. The per-module configuration takes precedence over the load-balancing configuration for the entire device. You can configure one load-balancing mode for the entire device, a different mode for specified
modules, and another mode for the other specified modules. You cannot configure the load-balancing method per port channel.
You can configure the type of load-balancing algorithm used. You can choose the load-balancing algorithm that determines which member port to select for egress traffic by looking at the fields in the frame.
Note: The default load-balancing mode for Layer 3 interfaces is the source and destination IP address, and the default load-balancing mode for non-IP interfaces is the source and destination MAC address.
From the config mode you can try different load-balacing method ,
port-channel load-balance {dest-ip-port | dest-ip-port-vlan |
destination-ip-vlan | destination-mac | destination-port | source-dest-ip-port | source-dest-ip-port-vlan | source-dest-ip-vlan | source-dest-mac | source-dest-port | source-ip-port | source-ip-port-vlan | source-ip-vlan | source-mac | source-port} [module-number]
To Summarize: I cannot say which port would be selected, it purely depends on type of frame you are sending with the combination of the load-balance method.
After tweaking you can also know from the command which link the traffic is taking,
NEXUS2-SPAN# show port-channel load-balance forwarding-path interface port-channel 71 src-ip 1.1.1.1 dst-ip 2.2.2.2 vlan 51 module 2
Module 2: Missing params will be substituted by 0's.
Load-balance Algorithm: src-dst ip-l4port
RBH: 0xb0 Outgoing port id: Ethernet8/8
we can also try tweaking the same load-balancing on the 2960 also. It purely depends on the load-balancing algorithm. Below is for 2960 Load-balancing tweaking,
http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_53_se/configuration/guide/swethchl.html
Even after doing this i wouldnt say 100% it would select one link.
Hope this helps!
Thanks,
Richard.
*Rate if this is useful

Configuring Port Channel on Cisco 2960S-48LPS-L

When I try to move port channel connections to two of the SFP ports on our Cisco 2960S switch, one of the connections fail.
I am using two GBics, both are the same, GLC-T-A 1000Base-T.
The port channel work fine when I use g1/0/47 and 48.
The port channel work fine when using g1/0/48 and SFP 1/0/49
Port channel does not work when using SFP 1/0/49 and SFP 1/0/50.

Cisco C2960S software version: 12.2(55)SE7. Using C2960S-UNIVERSALK9-M.
Port configurations for g1/0/48 - 51:
interface GigabitEthernet1/0/49
description Trunk to Cisco Core
switchport mode trunk
srr-queue bandwidth share 1 30 35 5
priority-queue out
mls qos trust cos
macro description cisco-switch
auto qos trust
spanning-tree link-type point-to-point
channel-group 2 mode on
When working, both ports show green status lights.
ort      Name               Status       Vlan       Duplex Speed Type
Po2       Trunk to Core      connected    trunk      a-full a-1000
*: interface is up
IHQ: pkts in input hold queue     IQD: pkts dropped from input queue
OHQ: pkts in output hold queue    OQD: pkts dropped from output queue
RXBS: rx rate (bits/sec)          RXPS: rx rate (pkts/sec)
TXBS: tx rate (bits/sec)          TXPS: tx rate (pkts/sec)
TRTL: throttle count
Interface               IHQ   IQD OHQ   OQD RXBS RXPS TXBS TXPS TRTL
* Port-channel2            0     0    0     0 8390000 909 970000 551    0
Age of the Port-channel   = 0d:10h:57m:35s
Logical slot/port   = 5/2          Number of ports = 2
GC                  = 0x00000000      HotStandBy port = null
Port state          = Port-channel Ag-Inuse
Protocol            =    -
Port security       = Disabled
Ports in the Port-channel:
Index   Load   Port     EC state        No of bits
------+------+------+------------------+-----------
0     00     Gi1/0/47 On                 0
0     00     Gi1/0/49 On                 0
When not working, one port shows green, then other port status light is off.
GigabitEthernet1/0/49 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 3c0e.233f.a531 (bia 3c0e.233f.a531)
Description: Trunk to Cisco Core
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000BaseTX SFP
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:09, output 00:00:19, 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 1954000 bits/sec, 213 packets/sec
5 minute output rate 38000 bits/sec, 16 packets/sec
     2935639 packets input, 880524431 bytes, 0 no buffer
     Received 2211794 broadcasts (310067 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 310067 multicast, 0 pause input
     0 input packets with dribble condition detected
             370489 packets output, 66729219 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     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
GigabitEthernet1/0/50 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet, address is 3c0e.233f.a532 (bia 3c0e.233f.a532)
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Auto-duplex, Auto-speed, link type is auto, media type is Not Present
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, 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 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 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
     0 packets output, 0 bytes, 0 underruns
--More--              0 output errors, 0 collisions, 1 interface resets
     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
Let me know if you need more info.

N7K Port Channel Layer 3 VLAN Question

I have 2 N7K switches and would like to connect them via port channel and put the channel in VLAN 101. I have the following config, does it make sense? Thanks in advance!
interface eth 3/1
switchport
channel-group 101 mode active
interface eth 3/2
switchport
channel-group 101 mode active
interface port-channel 101
switchport
switchport mode access
switchport access vlan 10
spanning-tree network type edge
interface vlan 10
ip address 10.1.1.1/24

Could be something like this in the both sides (if the port numbers match):
conf t
feature lacp
feature interface-vlan
interface eth 3/1
switchport
channel-group 101 mode active
interface eth 3/2
switchport
channel-group 101 mode active
interface port-channel 101
switchport
switchport mode access
switchport access vlan 101
spanning-tree port type network
interface vlan 101
ip address 10.1.1.1/24
no shut
end
vlan 101
end
*(This ip address will be available in only one box, you can use a FHRP as well, to increase the level of reachability)

For port-channel

Can I join Layer 2 MEC port channel with 10G SR and LR together?
We are thinking of using VSS setup.
VSS with Server Farm switches.
VSS sw1 and sw2 are in different building.
in order to save cost..
Server farm 1 with VSS sw1 will use 10G SR.
Server farm 1 with VSS sw2 will use 10G LR.
But I need to bundle that 10G SR and LR together to form L2 MEC..
Thanks,
John

hi John,
yes you can
one thing you need to check is that the qos scheduling match on the interfaces , they can differ depending on what cards they are on .....ie below (in bold)
even if they dont match -- there is a command to ignore this in etherchannel formation -- i can dig up if you need.
#sh int te 1/5/2 capabilities
TenGigabitEthernet1/5/2
Model:                 WS-X6708-10GE
Type:                  10Gbase-SR
Speed:                 10000
Duplex:                full
Trunk encap. type:     802.1Q,ISL
Trunk mode:            on,off,desirable,nonegotiate
Channel:               yes
Broadcast suppression: percentage(0-100)
Flowcontrol:           rx-(off,on),tx-(off,on)
Membership:            static
Fast Start:            yes
QOS scheduling:        rx-(8q4t), tx-(1p7q4t)
QOS queueing mode:     rx-(cos,dscp), tx-(cos,dscp)
CoS rewrite:           yes
ToS rewrite:           yes
Inline power:          no
Inline power policing: no
SPAN:                  source/destination
UDLD                   yes
Link Debounce:         yes
Link Debounce Time:    yes
Ports-in-ASIC (Sub-port ASIC) : 2-3,6,8 (2)
Remote switch uplink: no
Dot1x:                 no
Port-Security:         yes

3750-2960 Vlans Issue via Port Channel

Im trying to get all my vlans to pass thru to my 2960 user level switches, from my 3750 stack.
Each one of my 2960 stack is connected to my 3750 via port channel. Here is my port setup.
I have Vlans 1,210,214,216,220,306,406 on my 3750 stack. I cannot see those vlans on my 2960 stack. Why is that? What am I missing from the config?
Thanks...
3750 ports:
interface GigabitEthernet1/0/41
description Uplink to ETHSW03
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,210,214,216,220,306,406
switchport mode trunk
snmp trap mac-notification change added
snmp trap mac-notification change removed
spanning-tree guard loop
channel-protocol lacp
channel-group 7 mode active
interface GigabitEthernet1/0/42
description Uplink to ETHSW03
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,210,214,216,220,306,406
switchport mode trunk
snmp trap mac-notification change added
snmp trap mac-notification change removed
spanning-tree guard loop
channel-protocol lacp
channel-group 7 mode active
interface Port-channel7
description Uplink to ETHSW03
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,210,214,216,220,306,406
switchport mode trunk
snmp trap mac-notification change added
snmp trap mac-notification change removed
spanning-tree guard loop
Here are my 2960 ports setup:
interface GigabitEthernet1/0/47
description Uplink to CORE01
switchport trunk allowed vlan 1,210,214,216,220,306,406
switchport mode trunk
snmp trap mac-notification change added
snmp trap mac-notification change removed
spanning-tree guard loop
channel-protocol lacp
channel-group 1 mode active
interface GigabitEthernet1/0/48
description Uplink to CORE01
switchport trunk allowed vlan 1,210,214,216,220,306,406
switchport mode trunk
snmp trap mac-notification change added
snmp trap mac-notification change removed
spanning-tree guard loop
channel-protocol lacp
channel-group 1 mode active
interface Port-channel1
description Uplink to CORE01
switchport trunk allowed vlan 1,210,214,216,220,306,406
switchport mode trunk
snmp trap mac-notification change added
snmp trap mac-notification change removed
spanning-tree guard loop

I have 1 stack of 3750, connected with flex technology.
I have 3 stacks of 4-2960s, connected with flex technology.
Then, each 2960 stack is connected to my 3750 stack via port channels (gig ports x2).
Now, this is a second office site. We are connected to our datacenter via private ethernet line, and thats where most of our vlans and servers reside.
Output from 3750
P-DB-CORE01#sh vtp status
VTP Version capable             : 1 to 3
VTP version running             : 1
VTP Domain Name                 : NULL
VTP Pruning Mode                : Disabled
VTP Traps Generation            : Disabled
Device ID                       : 6c41.6a9c.a280
Configuration last modified by 10.2.20.1 at 3-3-93 23:43:55
Feature VLAN:
VTP Operating Mode                : Transparent
Maximum VLANs supported locally   : 1005
Number of existing VLANs          : 19
Configuration Revision            : 0
MD5 digest                        : 0x3D 0x05 0x4D 0x8C 0x31 0x07 0x34 0xDA
                                    0x2F 0x60 0xE8 0x24 0xA6 0x27 0x59 0x24
Output from 2960
P-ETHSW03-20.4#sh vtp status
VTP Version capable             : 1 to 3
VTP version running             : 1
VTP Domain Name                 : NULL
VTP Pruning Mode                : Disabled
VTP Traps Generation            : Disabled
Device ID                       : c07b.bcb2.9a80
Configuration last modified by 10.2.20.2 at 1-3-14 13:02:15
Local updater ID is 10.2.20.4 on interface Vl1 (lowest numbered VLAN interface found)
Feature VLAN:
VTP Operating Mode                : Server
Maximum VLANs supported locally   : 255
Number of existing VLANs          : 7
Configuration Revision            : 5
MD5 digest                        : 0x89 0x91 0xBA 0xE3 0x12 0x1B 0xDB 0x1D
                                    0x75 0x43 0x7F 0x8D 0x62 0x5A 0x09 0x70

SG500x Port-channel limited bandwidth

Good Day All,
I have 2 Cisco SG500X-48 setup as Master/Slave using SFP-H10GB-CU1M (10GB Twinax cable).
First question is with the twinax cables
Since on the SG500x's you can not configure the 2*10GE Stacking Combo ports. If I put two cables in for redundancy will this cause a network loop, or will STP/RSTP catch this?
Next question is limited bandwidth.
I setup 4 Interfaces to Port channel with LACP. On the Server(HP Proliant Gen8 server(s)) end have the NIC Team with 4 NICs. When I run a network stress tool, it seems to cap at around 68MBs. Each port should being 1Gb, shouldn't I be getting closer to 4 GB?
My Configuration would read much like this:
VLANs setup:
##1-RF System
##2-VOIP
##3-LAN
interface Port-channel 3
spanning-tree portfast
switchport trunk allowed vlan add ##1,##2
switchport trunk native vlan ##3
interface gigabitethernet2/1/5
spanning-tree portfast
channel-group 3 mode auto
switchport mode access
interface gigabitethernet2/1/6
spanning-tree portfast
channel-group 3 mode auto
switchport mode access
interface gigabitethernet2/1/7
spanning-tree portfast
channel-group 3 mode auto
switchport mode access
interface gigabitethernet2/1/8
spanning-tree portfast
channel-group 3 mode auto
switchport mode access
I dont have much under standing on QOS yet, I assuming this would be based on setting up this?
Any direction or help would be greatly appreciated
Chris,

Hello Chris,
The way the stacking cables works is it detects when you are using two of them and switches over to what is called 'ring' mode. It doesn't use both links at once, but if one of those links fails it will immediately use the second one, usually not even dropping one packet. STP isn't an issue on the stack ports because it doesn't really use it, the stacking is a proprietary protocol that handles all of this for you. So go ahead and plug up your second set of cables, you should see a log message saying you have moved from 'chain' to 'ring'.
As for LAGs, this is a common misconception with link aggregation. I understand the logic, you have 4 gig links, why can't you get 4 gigs of throughput? It has to do with how LAGs actually work.
When a packet arrives at the switch and needs to go out the LAG the switch runs a calculation on the source and destination IP (or source and destiantion MAC depending on your settings). From this calculation it comes up with a number, in your case from 1-4. That determines the link that it uses to get across that LAG. There is no way to make one conversation use more than one link, it just isn't how it works. So when you run a speed test from one IP to one other IP, the result of the switch's calculation will always be the same number, hence all the traffic for that stream goes down the same link in the LAG.
There isn't any spillover, so even if one link is much busier then the rest it doesn't move them over to one of the other links.
On some enterprise switches you can use a load balancing algorithm that uses source and destination port, which can result in multiple conversations between the same two clients to use multiple links, but on the Small Business switches we only have IP or MAC.
Basically any one conversation will always be limited to whatever the speed of 1 link in the LAG is.
It is possible to utilize the link more, but you would need several different computers talking to the server to really see that. QoS would not change this.
As for your speed, it is a bit low, the max for a gigabit link is about 118MB/s (lab max, your mileage may vary) if you are using normal sized frames. This is assuming two devices directly connected to the with no routing required. How are you testing the speed? I like to use a program called Tamosoft throughput tester for this, which is available free on the web.
Hope that helps a bit,
Christopher Ebert - Advanced Network Support Engineer
Cisco Small Business Support Center
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Span port channel

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