2960x port channel bandwidth command workaround

Folks:
I am looking for a work around - Currently I have a four member 2960x switch stack - I have Ten 1/0/1 and Ten 3/0/1 in a port-channel; however, when I try to set the 'bandwidth' on PO1 interface to 20000000 I receive an error, which corresponds being out of range, due to the links being 10Gbps.
Is there a work around so my PO1 interface reflects the correct bandwidth?
Switch I am using and version of software
Switch Ports Model SW Version SW Image
* 1 52 WS-C2960X-48TD-L 15.0(2)EX5 C2960X-UNIVERSALK9-M
Thank you
JJ

The tx-/rxload is probably the least of your problems. Assuming we're talking about a L2 port-channel the interface BW is base for spanning tree cost calculation. With a BW 10000000 kbit/s STP would consider the port-channel equal to a single 10GE link and could possibly decide to block your port-channel for a less favorable link.
That being said, the port-channel is supposed to have the correct BW corresponding to the number of bundled links without any need for manual user configuration.
I suppose it is either a software bug or there is an interface not bundled correctly.
Post the result of 'show etherc sum' here to check.
Regards

Similar Messages

ASA port-channel command on IOS v. 9.0(4)

I have configured 2 of ASA 5550 on a port channel as follows:
=======================================
router# show version
Cisco Adaptive Security Appliance Software Version 8.4(2)
router# show module
0 ASA 5550 Adaptive Security Appliance         ASA5550            JMX1226L1S9
1 SSM-4GE Included with ASA 5550 System        SSM-4GE-INC        JAF1224ATNS
router# show interface Port-channel48
Interface Port-channel48 "", is up, line protocol is up
Hardware is EtherChannel/ON, BW 2000 Mbps, DLY 10 usec
    Auto-Duplex(Full-duplex), Auto-Speed(1000 Mbps)
    Input flow control is unsupported, output flow control is off
    Media-type configured as RJ45 connector
    Available but not configured via nameif
    MAC address 001f.ca97.44e2, MTU not set
    IP address unassigned
Members in this channel:
      Active:   Gi1/2 Gi1/3
router# show startup-config
interface GigabitEthernet1/2
channel-group 48 mode on
no nameif
no security-level
no ip address
interface GigabitEthernet1/3
channel-group 48 mode on
no nameif
no security-level
no ip address
interface Port-channel48
no nameif
no security-level
no ip address
interface Port-channel48.4
vlan 4
interface Port-channel48.5
vlan 5
After migrating to version 9.0(4) I could not configure channel group on int g 1/2.
=======================================
router# show version
Cisco Adaptive Security Appliance Software Version 9.0(4)
router# show module
0 ASA 5550 Adaptive Security Appliance         ASA5550            JMX1421L333
1 SSM-4GE Included with ASA 5550 System        SSM-4GE-INC        JAF1419ALAK
router# configure terminal
router(config)# interface GigabitEthernet1/2
router(config-if)# channel-group 48 mode on
                      ^
ERROR: % Invalid input detected at '^' marker.
router(config-if)# ?
So I have the following questions about verion 9:
1. Can I still use port-channels on a sigle ASA?
2. Should I replace port-channel by lacp command on a sigle ASA?
3. Does lacp command can be used only on clusters ?
Att.,
Rosa

The following is documented in the config guide for both 8.4 and 9.0:
•You cannot use interfaces on the 4GE SSM, including the integrated 4GE SSM in slot 1 on the ASA 5550, as part of an EtherChannel.
So, even with 8.4 it was probably never meant to work.

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
*please rate helpful posts*

Interfaces in port-channel keep err-disabling because of keepalives

Below is the current portchannel that I am having problems with. The interfaces on Switch A keep going into an error disabled state because they receive their own loopback. Cisco says to disable keepalives and that it will fix the problem, but I do not like the idea of disabling keepalives. Has anyone found a solution other than disabling keepalives? Notice that ios's are different, but am not convinced that this is the issue. Also one is PoE and the other isn't. Lastly, i found this article "Keepalives are sent on all interfaces by default in Cisco IOS Software Release 12.1EA-based software. In Cisco IOS Software Release 12.2SE-based software and later, keepalives are not sent by default on fiber and uplink interfaces". I would think trunked interfaces in a port-channel would be uplink interfaces and if this is true, it should be sending out keepalives anyway since i am running the 12.2SE based ios. Thanks for whatever input you may have.
Switch A
C3750E Boot Loader (C3750X-HBOOT-M) Version 12.2(53r)SE2, RELEASE SOFTWARE (fc1)
System image file is "flash:/c3750e-universalk9-mz.122-55.SE3/c3750e-universalk9-mz.122-55.SE3.bin"
cisco WS-C3750X-48P
Port-channels in the group:
Port-channel: Po52
Age of the Port-channel   = 219d:04h:32m:49s
Logical slot/port   = 10/39          Number of ports = 4
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     Gi1/0/35 On                 0
0     00     Gi1/0/36 On                 0
0     00     Gi2/0/45 On                 0
0     00     Gi2/0/46 On                 0
%ETHCNTR-3-LOOP_BACK_DETECTED: Loop-back detected on GigabitEthernet1/0/35.
%PM-4-ERR_DISABLE: loopback error detected on Gi1/0/35, putting Gi1/0/35 in err-disable state
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/35, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel39, changed state to down
%LINK-3-UPDOWN: Interface Port-channel39, changed state to down
Switch B
C3750E Boot Loader (C3750X-HBOOT-M) Version 12.2(53r)SE2, RELEASE SOFTWARE (fc1)
System image file is "flash:/c3750e-universalk9-mz.122-58.SE2/c3750e-universalk9-mz.122-58.SE2.bin"
cisco WS-C3750X-48
Port-channels in the group:
Port-channel: Po52
Age of the Port-channel   = 443d:18h:43m:06s
Logical slot/port   = 10/39          Number of ports = 4
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     Gi1/0/35 On                 0
0     00     Gi1/0/36 On                 0
0     00     Gi1/0/45 On                 0
0     00     Gi1/0/46 On                 0

PER CISCO
Symptom:
An interface on a Catalyst switch is errordisabled after detecting a loopback.
Mar 7 03:20:40: %ETHCNTR-3-LOOP_BACK_DETECTED: Loop-back detected on
GigabitEthernet0/2. The port is forced to linkdown.
Mar 7 03:20:42: %LINK-5-CHANGED: Interface GigabitEthernet0/2, changed state
to administratively down
Mar 7 03:20:43: %LINEPROTO-5-UPDOWN: Line protocol on Interface
GigabitEthernet0/2, changed state to down
Conditions:
This might be seen on a Catalyst 2940, 2950, 2950-LRE, 2955, 2970, 3550, 3560
or 3750 switch running 12.1EA or 12.2SE based code.
Workaround:
Disable keepalives by using the no keepalive interface command. This
will prevent the port from being errdisabled, but it does not resolve the root
cause of the problem. Please see section below for more information.
Additional Information:
The problem occurs because the keepalive packet is looped back to the port that
sent the keepalive. There is a loop in the network. Although disabling the
keepalive will prevent the interface from being errdisabled, it will not remove
the loop.
The problem is aggravated if there are a large number of Topology Change
Notifications on the network. When a switch receives a BPDU with the Topology
Change bit set, the switch will fast age the MAC Address table. When this
happens, the number of flooded packets increases because the MAC Address table
is empty.

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

Configuring 9222i for Port-Channels to 6500

I need to configure an MDS 9222i to do EhterChannel for redundant links to a Cisco 6500. I have tried to configure channel-group on the GE interface and I get an error (see below)
b0maumigrjax(config-if)# channel-group 1
command failed: Member list of different interface types not supported [created]
9222i Config
interface port-channel 1
channel mode active
switchport rate-mode dedicated
interface GigabitEthernet1/1
ip address 1.1.1.10 255.255.255.0
switchport description Core.Link.Connection.22
no shutdown
interface GigabitEthernet1/2
ip address 1.1.1.1.11 255.255.255.0
switchport description Core.Link.Connection.23
no shutdown
6500 Config
Interface Port-Channel 1
sw acc vlan 10
interface GigabitEthernet1/2
channel-group 1 mode active
no shut
interface GigabitEthernet1/1
channel-group 1 mode active
no shut

David,
I tried that as well. I still was not able to get the interface's to come up in sh ether summ on the switch.
fcip profile 1
ip address 10.136.120.10
tcp max-bandwidth-mbps 50 min-available-bandwidth-mbps 20 round-trip-time-ms 5
fcip profile 2
ip address 10.136.120.11
tcp max-bandwidth-mbps 50 min-available-bandwidth-mbps 20 round-trip-time-ms 5
interface fcip1
use-profile 1
peer-info ipaddr 10.136.120.13
channel-group 1 force
no shutdown
interface fcip2
use-profile 2
peer-info ipaddr 10.136.120.14
channel-group 1 force
no shutdown

"The `Inline' mode also supports `Port-Channel'" ?

Referring to this document:
http://www.cisco.com/en/US/solutions/collateral/ns340/ns517/ns224/ns377/deployment_guide_c07-490578.html
it states:
"The `Inline' mode also supports `Port-Channel', which enables load-balancing and `high-availability' should one of the physical link fails"
is this true? I have a WAVE-474 which comes with 1 onboard port and 2 inline ports. Can you configure those 2 inline ports in a port channel and then use it with WCCP? I don't believe you can. Not sure what the document is referring too.
I also have WAVE-574's and that one can do port-channel using two onboard GIG interfaces + WCCP.

Hi Roman,
Your judgement was right. You can not configure inline interface in a port channel configuraiton.
Here is the output from wae-612 running 4.1.5c . You will see that there is no option for port channel / channel-group with inline interface.
WAE612-3(config)#int inlineGroup ?
<1-4>/ Slot number
WAE612-3(config)#int inlineGroup 1/0
WAE612-3(config-if)#?
autosense      Interface autosense
bandwidth      Interface bandwidth
encapsulation Set encapsulation type for an interface
exit           Exit from this submode
failover       Modify failover parameters
full-duplex    Interface fullduplex
half-duplex    Interface halfduplex
inline         VLAN's to intercept
ip             Interface Internet Protocol Config commands
no             Negate a command or set its defaults
shutdown       Put the inline interface in passthrough mode
WAE612-3(config-if)#exit
WAE612-3(config)#int g 1/0
WAE612-3(config-if)#?
autosense      Interface autosense
bandwidth      Interface bandwidth
cdp            Cisco Discovery Protocol Interface Config commands
channel-group Configure EtherChannel group
description    Interface specific description
exit           Exit from this submode
full-duplex    Interface fullduplex
half-duplex    Interface halfduplex
ip             Interface Internet Protocol Config commands
mtu            Set the interface Maximum Transmission Unit (MTU)
no             Negate a command or set its defaults
shutdown       Shutdown the specific interface
standby        Standby interface config commands
WAE612-3(config-if)#
Hope this helps.
Regards.

Port channel fsps weight counting

How will FSPF counts path weight in port chanal case? For example - there is two fisical lincks with different speeds - 2 and 1 gig. What fspf count i'll have?

Sorry but you can't mix 1g with 2g. All members of a port-channel must be the same speed. See the output of command "show port-channel compatibility-parameters" for more detail.
Now lets say you have 5 x 2gbps links in a port-channel. The bandwidth sum will be 10gbps. The cost for a a 1gbps link is 1000, so therefore the cost for a 10gbps port-channel will be one tenth of 1000, ie cost=100.

6880 L2 Port-Channel

Hi
I want to configure a port-channel with a downstream 2960x switch. The 6880 does not let me configure a L2 port-channel. On the 6880 when I configure the port-channel first, the the interfaces, during the interface configs the error states either the switchport is L2 or port-channel, or vice versa
I have managed this easily on other switches. Is there any special command on the 6880 to configure a l2 port-channel
Attempted the following configs
2960x
Interface port-channel 1
switchport mode trunk
interface gig 1/0/28
switchport mode trunk
udld port aggressive
channel-protocol lacp
channel-group 1 mode Active
mls qos trust dscp
interface gig 2/0/28
switchport mode trunk
udld port aggressive
channel-protocol lacp
channel-group 1 mode Active
mls qos trust dscp
6880x
interface Tengig 1/5/2
switchport mode trunk
channel-group 11 mode Active
******at this stage when I try to add the switchport mode trunk command as below under the interfac, the error states command rejected, either the switchport is in L3 mode and the port-channel l2 or vice versa
interface Tengig 2/5/2
switchport mode trunk
channel-group 11 mode Active
interface port-channel11
switchport
switchport mode trunk

Hi,
After adding "channel-group 11 mode Active" to both ports 1/5/2 and 2/5/2.
Now go to the Portchannel interface and add the "switchport mode trunk" there.
int po 11
switchport mode trunk
no sh
now "switchport mode trunk" should propagate to both physical interfaces.
HTH

Port-channel disoblige

Hi Folks,
We have a trouble in port-channel for an interface with point-point link, assigning ip to that interface possibly can make a ping,, whereas bringing the same interface to port channel assigning those same IP and try pinging to each other, unfortunately can't ping.
switch 1#
interface Ethernet2/20
speed 1000
duplex full
bandwidth 1000000
udld disable
channel-group 2
no shutdown
switch 2#
interface Ethernet2/37
speed 1000
duplex full
bandwidth 1000000
channel-group 2
no shutdown
switch 1#
Command: show running-config interface port-channel2
Time: Fri Dec 27 09:49:3 2013
version 6.0(1)
interface port-channel2
speed 1000
duplex full
ip address 1.2.3.1/30 --> altered ip
switch 2#
Command: show running-config interface port-channel2
Time: Fri Dec 27 09:50:48 2013
version 6.2(2)
interface port-channel2
speed 1000
duplex full
ip address 1.2.3.2/30 --> altered ip
Please review and suggest us some valuable recommendation to overcome this issue.

What switch is this? Generally, to create a L3 etherchannel, you'll need to configure "no switchport" on the physical interfaces before you can use an address on the port channel interface.
HTH,
John
*** Please rate all useful posts ***

Right way of configuring higher MTU over a Port Channel

Hi guys,
I have a running critical Port-Channel between two locations.
Here's the config
SW1:
interface Port-channel2
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
end
interface GigabitEthernet1/45
switchport trunk encapsulation dot1q
switchport mode trunk
channel-protocol lacp
channel-group 2 mode active
end
interface GigabitEthernet1/46
switchport trunk encapsulation dot1q
switchport mode trunk
channel-protocol lacp
channel-group 2 mode active
end
SW2
interface GigabitEthernet1/1
switchport trunk encapsulation dot1q
switchport mode trunk
channel-protocol lacp
channel-group 2 mode passive
end
interface GigabitEthernet1/2
switchport trunk encapsulation dot1q
switchport mode trunk
channel-protocol lacp
channel-group 2 mode passive
end
interface Port-channel2
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
end
Now I need to increase the MTU from default value to 9198. What the right way to do it and avoid any connectivity loss, PortChannel restart.
Does it matter what switch I start first?
Thanks!
L.E. both SW are WS-C4948

Hi,
Because you are using layer 2 interfaces - there is no fragmentation support at layer 2, and interfaces receiving frames which have an unsupported size will be dropped.
I think the best way for you to proceed is to lab this up; and verify what happens - it may be that you need to make changes on switches at either end of the channel within a very short time frame to prevent too large an outage.
When you are ready to maike your change - think the best way to do this is to use the interface range command, and apply the 'mtu' command to all the interfaces in this range. I don't think it matters which switch you apply this change to first, and I don't believe if you are hinting at the 802.3ad (controlled by system-priority) decision maker, that it makes any difference.
HTH
Mike

Lacp port channel shows down on one 5k

I got one side of my lacp port channel down.
the topology is shown but the left side is showing down
20 Po20(SD) Eth LACP Eth1/5(s) Eth1/6(s)
# sh int port-channel 20
port-channel20 is down (No operational members)
Hardware: Port-Channel, address: 547f.eebb.644d (bia 547f.eebb.644d)
Description: **To-VA-7004**
MTU 1500 bytes, BW 100000 Kbit, DLY 10 usec
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA
Port mode is trunk
auto-duplex, 10 Gb/s
Input flow-control is off, output flow-control is off
Switchport monitor is off
EtherType is 0x8100
Members in this channel: Eth1/5, Eth1/6
Last clearing of "show interface" counters never
30 seconds input rate 80 bits/sec, 0 packets/sec
30 seconds output rate 176 bits/sec, 0 packets/sec
Load-Interval #2: 5 minute (300 seconds)
input rate 112 bps, 0 pps; output rate 288 bps, 0 pps
RX
4286 unicast packets 785765 multicast packets 1493093 broadcast packets
2283144 input packets 248607161 bytes
13 jumbo packets 0 storm suppression bytes
0 runts 0 giants 0 CRC 0 no buffer
0 input error 0 short frame 0 overrun 0 underrun 0 ignored
0 watchdog 0 bad etype drop 0 bad proto drop 0 if down drop
0 input with dribble 0 input discard
0 Rx pause
TX
0 unicast packets 3397636 multicast packets 0 broadcast packets
3397636 output packets 399463036 bytes
0 jumbo packets
0 output errors 0 collision 0 deferred 0 late collision
0 lost carrier 0 no carrier 0 babble 0 output discard
0 Tx pause
2 interface resets
sh run interface port-channel 20 membership
!Command: show running-config interface port-channel20 membership
!Time: Mon Feb 2 23:04:37 2015
version 5.1(3)N2(1b)
interface port-channel20
description **To-VA-7004**
switchport mode trunk
switchport trunk allowed vlan 1,200-202,251
interface Ethernet1/5
description **TO-VA-7004-ETH3/45**
switchport mode trunk
switchport trunk allowed vlan 1,200-202,251
channel-group 20 mode active
interface Ethernet1/6
description **To-VA-7004-ETH4/46**
switchport mode trunk
switchport trunk allowed vlan 1,200-202,251
channel-group 20 mode active
but on the right side everything is up,
20 Po20(SU) Eth LACP Eth1/5(P) Eth1/6(P)

It seems have a problem on interfaces => 20 Po20(SD) Eth LACP Eth1/5(s) Eth1/6(s)
Can you share us the status about interfaces 1/5 - 6 & 3/45, 4/45 of 7k?
Do you have configured per Ethernet interfaces or on the Po ?

Sg300-28 port-channel options

i have an sg300-28 running the latest firmware, and would like some insight on port-channel options. below are the port configs i have for a LAG to my router. i am currently using 802.3ad with LACP. my router is a linux machine pulling duty as a basic (no dynamic routing) router, firewall and internet gateway. the bonding options on the routers side explained at
http://docs.fedoraproject.org/en-US/Fedora/16/html/System_Administrators_Guide/sec-Using_Channel_Bonding.html. the mode is 4 or 802.3ad and the xmit_hash_policy is 2 or layer2+3. i also have 2 servers setup in a similar fashion with 2 interfaces in a LAG.
when i run a bandwidth test, iperf, between the two servers, i only get 900+ mbps which indicates that the GB ports are running fine. this also indicates to me that the traffic is not being "striped" across the port-channeled interfaces, thereby giving me the aggregated bandwidth of all interfaces in the LAG. i have found no options to use the balance-xor mode to create port-channels, which as i understand it, would aggregate the total bandwidth of all interfaces in the LAG. is the sg300 capable of creating a LAG that will combine the throughput of all the members of the LAG? for example, create a 2 GB pipe when 2 interfaces are port-channeled? is the balance-xor mode what would do this (regardless of the sg300's ability to do this)
interface gigabitethernet25
description "Port Channel to Router"
channel-group 1 mode auto
lldp notifications enable
lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
lldp management-address automatic
interface gigabitethernet26
description "Port Channel to Router"
channel-group 1 mode auto
lldp notifications enable
lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
lldp management-address automatic
interface gigabitethernet27
description "Port Channel to Router"
channel-group 1 mode auto
lldp notifications enable
lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
lldp management-address automatic
interface gigabitethernet28
description "Port Channel to Router"
channel-group 1 mode auto
lldp notifications enable
lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
lldp management-address automatic
interface Port-channel1
description "Port Channel to Router"
switchport mode general
switchport general allowed vlan add 2-3,25,37,50,52,253-255 tagged
switchport general pvid 255

Hi Brendan,
You said "i only get 900+ mbps which indicates that the GB ports are running fine. this also indicates to me that the traffic is not being "striped" across the port-channeled interfaces, thereby giving me the aggregated bandwidth of all interfaces in the LAG. i have found no options to use the balance-xor mode to create port-channels, which as i understand it, would aggregate the total bandwidth of all interfaces in the LAG."
As the Admin guide says on page 130, http://www.cisco.com/en/US/docs/switches/lan/csbms/sf30x_sg30x/administration_guide/78-19308-01.pdf
Load Balancing
Traffic forwarded to a LAG is load-balanced across the active member ports, thus achieving an effective bandwidth close to the aggregate bandwidth of all the active member ports of the LAG.
Traffic load balancing over the active member ports of a LAG is managed by a hash-based distribution function that distributes Unicast and Multicast traffic based on Layer 2 or Layer 3 packet header information.
The switch supports two modes of load balancing:
By MAC Addresses—Based on the destination and source MAC addresses of all packets.
By IP and MAC Addresses—Based on the destination and source IP addresses for IP packets, and destination and source MAC addresses for
non-IP packets.
   So, an IP host running running IPERF maybe checking unicast throughput between the two IP hosts. There will be a Source and Desination IP address in that test. The switch will direct the traffic over one of the LAG port members . It wont Round robin the unicast traffic over multiple LAG ports, if the Source and Desination IP address of the traffic is the same. .
If the PC running IPerf, had another concurrent IPerf session to another or different IP host, the hash algorithm on the switch may direct that stream , maybe, over a different physical LAG interface.
So your comment about achieving 900+mbps sounds normal   Yes LAG spreads the load, the benefit comes when lots of hosts on both sides of the switches.
You hay find with just two hosts on either side of a LAG, that the switch may run the traffic between two hosts over just one member of the LAG group.
regards Dave

Load-balancing Algorithm for NX-OS Port Channels

Hi, all
I do not understand description of port-channel load-balance ethernet command.
switch(config)# port-channel load-balance ethernet ?
destination-ip         Destination IP address
destination-mac        Destination MAC address
destination-port       Destination TCP/UDP port
source-dest-ip         Source & Destination IP address (includes l2)
source-dest-ip-only    Source & Destination IP addresses only
source-dest-mac        Source & Destination MAC address
source-dest-port       Source & Destination TCP/UDP port (includes l2 and l3)
source-dest-port-only Source & Destination TCP/UDP port only
source-ip              Source IP address
source-mac             Source MAC address
source-port            Source TCP/UDP port
Please tell me what the following descriptions mean.
Source & Destination IP address (includes l2)
Source & Destination TCP/UDP port (includes l2 and l3)
What are the meaning of "includes l2" and "includes l2 and l3" ?
Thank you for your cooperation in advance.

Hi Satoru,
On the Nexus 5000/6000 platforms, all FEXs will inherit the global hashing algorithm from the parent device.
On the Nexus 7000 platform, hashing algorithms can be assigned on a per FEX basis (all load balancing changes must be made from the Admin VDC):
N7K-A(config)# port-channel load-balance src-dst ip-l4port fex 134
Any FEX without a hashing algorithm configured with inherit the global hash. Making changes to the modular/global hash will not alter FEX specific hashing algorithms.
To verify the configuration applied you can use this command:
N5K_A# show port-channel load-balance
On the Nexus 7000, the per FEX algorithm can be checked by appending the ‘fex <#>’ to the end of the command in the Admin VDC or the FEX’s respective VDC:
N7K-A(config)# show port-channel load-balance fex 134
Regards,
Richard

WLC LAG Mode and Port Channel

So I was reading the controller best practices and got this:
When you use LAG, the controller relies on the switch for the load balancing decisions on traffic that come from the network. It expects that traffic that belongs to an AP always enters on the same port. Use only ip-src or ip-src ip-dst load balancing options in the switch EtherChannel configuration. Some switch models might use unsupported load balancing mechanisms by default, so it is important to verify.
This is how to verify the EtherChannel load balancing mechanism:
switch#show etherchannel load-balance
EtherChannel Load-Balancing Configuration:
src-dst-ip
EtherChannel Load-Balancing Addresses Used Per-Protocol:
Non-IP: Source XOR Destination MAC address
IPv4: Source XOR Destination IP address
IPv6: Source XOR Destination IP address
This is how to change the switch configuration (IOS):
switch(config)#port-channel load-balance src-dst-ip
Now Cisco switches by default will do src-mac. If I make this change obviously this would be a global change. I don't believe it should cause any performance issues but wanted to get some expert opinions on this. Switches my controller will be connected to will also have two routers connected as well via Port Channel.
I'm trying to understand the reasoning behind this.

I've never seen that command cause any issues in any deployment I've worked on.
HTH,
Steve

2960x port channel bandwidth command workaround

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