Cisco Switching/Routing :: Standby Blade Switch 3030 Upstream Port-channel Flapping Up-down
Apr 30, 2012
show logging
May 1 16:00:30: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/12, changed state to down
May 1 16:00:39: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/12, changed state to up
May 1 16:17:28: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/12, changed state to down
May 1 16:17:36: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/12, changed state to up
May 1 16:25:28: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/11, changed state to down
May 1 16:25:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/11, changed state to up
May 1 17:19:25: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/11, changed state to down
Configuration as below:
macro name vmware
switchport trunk encapsulation dot1q
switchport mode trunk
no switchport access vlan
[code].....
Note:Both active blade switch and standby one are connecting to same aggregate switch 3750. Yet the active one, with same config as standby one, has not occurred this issue.
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Aug 6, 2012
I try to connect a cisco blade switch 3020 to Nexus 2232 with etherchannel, but when I connect the second link a obtain flapping on vlans. [code] why the vlans are flapping ? it's something wrong on the config ? [code]
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Sep 11, 2012
I have two Core 6509E SUP2T configued as VSS and has two 48 ports fiber blades. I have two 3750s, I have two gig on each 3750 port-channle to po1 and connected to both the core, one link to each core.Now, I was asked ot add two more links on each 3750 switch to make it a total of 4 gigs on each 3750s (all 4 gig ports/uplinks will be in used an dtwo links to core one an dtwo links to core 2).when i added two additional links on 3750s and bundled them to po1, I created another port channel on core and bundeled the additional two gigs on each core to accomodate for the two additional links (ports on core switches are not consequtives).
adding these two additional ports makes the 3750 switches flap between managemnet vlan and po1.now, i am not sure if I must have added the two additional links on the core to teh current port-channel or core!? I have created another port-channel on core to accomodate for this currently!?
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Mar 11, 2012
I have an issue with a Cisco 3750 switch stack which is connected to two seperate upstream Cisco 3750's which are administered by an ISP. The ISP is experiencing MAC address flapping from one of my VLAN SVI's i am using to route traffic upstream
[code]...
As you can see I utilise a VLAN SVI to route traffic to the upstream 1.1.1.2 (illustration only) IP. As per the diagram of the topology attached, the ISP is receiving a MAC address flapping error confirming the SVI MAC address from my switch stack is being learnt on the trunk port connecting switch 1 and switch 2, and also the port (Gi1/0/48) directly connected to my switch stack. As these are all Layer 2 links essentially being passed upstream and then connected between the two ISP switches, we have a 3 way triangular loop formed.
If I was to remove the port channel configuration from the two ports associated with the VLAN SVI, am i right in suggesting this would still form a layer 2 loop? The two ports would still be a member of the SVI VLAN, and it is the VLAN MAC address which is being learnt by the two ISP switches on different interfaces.
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May 8, 2013
I am trying to configure port-channel from one switch to two switchs, and only one interface of each switches make part of the port channel.Cisco IOS Software, ME380x Software (ME380x-UNIVERSALK9-M), Version 12.2(52)EY4, RELEASE SOFTWARE (fc1) [code]
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Apr 23, 2012
I would like to know how many port channel can i configured in the switch 3750 X ? and if there is a limitation by IOS ?
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Jul 30, 2012
Configured Layer 3 portchannel from 6500VSS enabled switch to two different 6500 standalone switch. Configured first ip on VSS switch, second ip on standalone switch1 and third IP on standalone switch2. My question is
1. Will the portchannel be up?
2. If port channel is up, will I able to ping the connected IP's.
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Feb 14, 2013
Can i configure access ports into port channel on Nexus 7K switch.If possible then provide the complete configuration.....
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Oct 9, 2011
I have setup LAG for one of our 5508 controllers and have connected 4 of the 8 ethernet ports to a 4507 switch. After configuring 2 port channels on the switch we are receiving a host flapping error between the port channels and it seems to be causing a serious slowdown on the switch. When I shutdown one of the port channels the error goes away and traffic returns to normal. I have the same configuration at other locations with the only difference being the switches used are 3750G-12S and I do not see the host flapping error. It appears to only be a problem with modular switches.
One other thing of note: I read a Cisco white paper on LAG and it suggested creating the port channels over 2 different modules. For example, put ports G4/24 and G5/24 in port channel 1 and G4/25 and G5/25 in port channel 2. I tried this but I still got the host flapping error.
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Oct 21, 2012
I have vm with 2 nic card and 2 blade switch 3120g in the same hp c7000 blade enclosure. How to setup etherchannel as highlight in attachment ?
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Dec 29, 2011
Looking at the specs for WS-X6704-10GE, it shows the port buffers at 16M per port. This doesn't seem like very much for a 10G port. Is this upgradable or related to how much RAM is in the blade?
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Apr 16, 2012
i have one of my switch modules that shows PwrDown when i issue the command show mod.
Mod Ports Card Type Model Serial No.
--- ----- -------------------------------------- ------------------ -----------
1 9 Supervisor Engine 32 8GE (Active) WS-SUP32-GE-3B SAD09120263
2 48 48 port 10/100/1000mb EtherModule WS-X6148-GE-TX SAL1029VWZ5
[Code]....
i tried disabling the diagnostic monitor for the module, did a power enable module command and then reset it but it still fails. this is the third blade that i am replacing in a few weeks and i still get the same error. i am persuded that it is not a hardware since it is the third blade in a matter of weeks. after the module reset, i receive this error % module 3 is operationally off (FRU-power failed)
could an ios upgrade solve this issue? are there any ios related bugs?
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Mar 17, 2013
I received 3 GESM cisco blade switches for a HP Blade system. I do not have the chassis. I need to sanitize these blade switches but I have never worked with these. I don't see any removable flash. Where is the config stored?
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Feb 4, 2013
I have a 2960 switch and every then and now the ports are flapping, while i was on console i saw ports going down and coming up...when the ping to machine ip addresses timed out the port status on switch was still up...no errors collisions seen on sw port. Below is sh int when the port was flapping
[code]...
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Jul 27, 2011
I have 6 of these WS-CBS3012-IBM modules that need to be configured but I cannot access the USB console port. I was told I could just get any DB9- to- USB cable and that would work. I did buy a DB9-to-USB cable and it did not work. I looked up the installation guide for this module and it just said the console cable is DB9-to-USB but with no part number.
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Jun 4, 2012
We have some legacy Cisco 6513 switches with the backbone (16-port GBIC blade) MTU set to 1500. It has a WS-X6148A-GE-TX blade as well, MTU set to 9K.
Now we have a customer sending MTU of 1546, their copper interface terminating on WS-6148A keeps flapping. Does the flapping have something to do with the backbone set to 1500? We cant set the backbone to 9K at this moment since it may be intrusive (reuire a reboot).
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Jun 13, 2012
Where can I find a sample working configuration of (HP rebadged) 3120 Blade Switch?
I have the Cisco 6500 end configured as follows:
interface Port-channel1
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,300,304,310,320,560-562,600,740,770,950
switchport mode trunk
load-interval 30
[code]....
I will be connecting 9/5 and 9/6 to Cisco 3120G (HP rebadged) Blade Switch in c-Class Enclosure tomorrow.It would be nice to have a rough sample configuration of the above 3120G switch.
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Jul 23, 2012
we have cisco 2960 switch which is connected to a cisco 2811 router. flapping issue between these two devices??
The following actions i have taken, but no result.. I have changed cables. have set speed to 100 and duplex full on both the interfaces but the interfaces are showing up up still not getting connectivity. same i have to auto on both sides still no result what configurations should i set to resolve this issue...?
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Mar 10, 2012
We have a pair Cisco 6509 switch in which 2 * 48 Port 1G line cards and 1 * 16 Port 10G line Card, FWSM and Sup 720 are installed.We have Cisco UCS and HP Blade servers.Cisco UCS servers are connected to Cisco 6509 switch using Fabric Interconnect, and HP Servers are directly connected to core switches.Recently the team made many changes in the network. Upgraded the IOS in Cisco 6509 switch, Configured Port profiling , MAC Pinning , HBA Cards to UCS / Nexus 1000V Infrastructure. After this change they lost the connectivity to UCS and HP Serers. Every tower is checking at their end.
The Network Team has reverted back the core switch with old IOS , but still the problem persisit.I could only see the following error log in the core switch. There are two port-channels one between core 1 and core 2. The other is between core switch and FWSM module. [code]
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Oct 2, 2012
I have Cisco 1811 and Cisco 2960 interconnect with each other by TRUNK link. As time pass i recieving below log on cisco 1811 router.
DTP-5-NONTRUNKPORTON: Port Fa8 has become non-trunk
LINEPROTO-5-UPDOWN: Line protocol on Interface FastEtherne t8, changed state to down
LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan100, changed state to down
LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan200, changed state to down
LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan300, changed state to down
LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan400, changed state to down
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Sep 12, 2012
Have 2 N2K with dual-connections to both 2 N5K, will all 4-ports of N5K will be the same port-channel. N2K as well ?
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Nov 29, 2011
I need to configure a port channel between two sw 4507R. with port Giga, but those port are in different modules.
Sw-1
interface GigabitEthernet5/48
description **** Conexion Switch-2*****
[Code].....
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Jun 4, 2012
I was upgrading IOS on 4507 R with dual supervisor.I download the IOS on Active supervisior and did reboot.After reboot i login to switch then i got switch standby prompt.I found that after reboot active supervisior became standby supervisior.
Now new IOS is on standby supervisior.Need to confirm below..So this means that IOS does not syn within the supervisiors as compared to config right ?
-Which command i can use that will copy IOS from standby supe to Active supe??
-Which command i can use that will show both active and standby supe with new IOS?
-Is there any command that i can use to switchover from active to standby supe??
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Dec 7, 2011
I have 3750 core/distribution switches with routing enabled in two offices connected with copper link and L3 port channel interfaces. NewOffice#2 has moved about 5 miles farther away from office#1 and I have to deploy new core/distribution switch connect it to old core#2 via F.O and move all access switches with it. Old core will stay in old #2 offices as a bridge between office#1 and new office#2 Office#1core<->copper (Ethernet) <->oldoffice#2core<->f.o. <->new office#2core How I should configure port channels ports on oldoffice#2 core to act as bridge between office#1 core/dist and newoffice#2 core/dist without changing anything else (ip, etc) on whole network
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Apr 22, 2012
I have 2 Cisco 6509 switches linked together via single Fibre as a trunk.I want to change this to a port channel where I will add another 3 fibre ports to the port channel but what order do I do this to minimise any disruption.
1-Configure PortChannel and add the 3 new ports, this will bring up the Port Channel but what effect will this have on traffic currently going over the single Trunk link? Will spanning tree go mad, how will switches react?
2-Convert existing Trunk link to Portchannel then add in new ports to PortChannel, I guess in doing this there will be a small hit on traffic as it changes to a port channel.
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Feb 24, 2012
We have 2 6513's that are linked via 2 10 gig interfaces, using an LACP channel.I received an alert this aft stating that the far 6513 was unreachable and the port channel int PO3 had gone down, the 2 10 gig interfaces had also gone down on either side. 5 mins later PO3 had resestablished itself and has been fine since. [code]
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Feb 7, 2013
We are running nexus 5018 in our DC.What is the difference betwen "channel-group 214 mode active" and " channel-group 216" Any difference?.. because i have problem with this config we are going build a server config?
We have problem with porth channel down.
5K# sh int po71
port-channel71 is down (No operational members)
vPC Status: Down, vPC number: 71 [packets forwarded via vPC peer-link]
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Jan 22, 2012
I set up a port-channel trunk between a acess switch 3750 ( int gi2/0/1 and gi2/0/2) and Core 6509( int gi7/11 and gi7/12).
On the both the 3750& 6509 I configured:
interface Port-channel15
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100,103
switchport mode trunk
But the ports on the core g7/11 and g7/12 keep shutdown and when I do show interfaces port-channel 15, it show the interface is shutdown.
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Nov 16, 2011
I have router connected to 2 3550 switches directly. 3550A and B switches are running HSRP. OSPF is running between Router and 2 switches.
From Switch B i can ping the Router Wan interface but not the internet sites. from Switch A i can ping any sites?
Switch B
3550SMIB# sh ip routeCodes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1
[Code]......
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Oct 28, 2012
I have one Catalyst 6509E chassis and two SUP720. The bootup sequence on SUP 720 (standby hot) failed . Messages that appear on SUP 720, on the console port indicate o software crash. I don't have a flash card in SUP720.
This is the bootup process:
System Bootstrap, Version 8.5(3)
Copyright (c) 1994-2008 by cisco Systems, Inc.
Cat6k-Sup720/SP processor with 1048576 Kbytes of main memory
[code].....
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Feb 27, 2013
I am building a new network and intended on using the min-link feature on my port-channels between a 3750-X series switch and Nexus 4k.
However reading further into this it seems this feature is only supported on higher end models. I cannot find any reference to the min-links feature in the 3750-X configuration guide. Is this an available feature?
The 3750-X model is WS-C3750X-24T-L running IOS 12.2(55)SE3 IP Services
My thoughts is that the is only an LACP supported feature so I may not see the command until I have entered an LACP specific command on the port-channel but unfortunately I do not have a 3750X to verify this on at present.
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Jan 17, 2012
We have one 3825 router used as voice gateway. For redudancy, we want to connect it to two different switches which has STP and HSRP running. Can I create a port-channel with two Giga interfaces in 3825 and connect to two different switches? Should I configure port channel in switch with only one port in each port-channel? I know server can be connected to different switches with NIC teaming. I just want to mimic that kind of setup. I did one time for port-channel in 3825, but it was connected to a stacked 3750X. So it's different case now.
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Jan 22, 2012
I have a pair of 6500's setup with VSS and there is currently only one link between then. However one end of the link is on Po10 and the other end is on Po25. If I move the Po25 over to Po10, will things break? It seems to be working fine now. I'm about to add a second link and I'm concerned about the current configuration. It makes more sense to me to have both ends of the same link on the same port-channel ID. I've seen documentation which states otherwise however.
interface Port-channel10
no switchport
no ip address
[Code]....
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