Cisco Switching/Routing :: Packet Discard On Nexus 5020 Link To Nexus 5K

Feb 23, 2011

We are facing issue of continous packet discards On nexus4001L link (int po2) to Nexus5020 switch. Nexus4001L is installed in IBM blade center server and we have FCOE enabled in this setup. [code]

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Cisco Switching/Routing :: VPC Peer-link Between Nexus 5010 And 5020

Aug 7, 2012

I'm trying to create a vpc between a Nexus 5010 and Nexus 5020 switch. I recently upgraded the software so they are running the same version. I connect get a vpc link. Is there something wrong with my setup? Is a vpc between a 5010 and 5020 even possible? They are connected using a pair of Intel X520's in 802.3AD teaming mode. [code]

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Cisco Switching/Routing :: Input Discard On Nexus 4001?

Nov 17, 2011

I have 2 NX4001. Each one has an uplink to a 5K. There is no VPC between the 4K and the 5K. The 5K are  VPC enabled.There is a large number on input discards on the 4001 interfaces connected to the 5K and is incrementing.I have a server with smartfailover that is flapping and I think the input discard might be the culprit.what is the cause on input discard. Note: All NXOS  to the latest.

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Cisco Switching/Routing :: Nexus 5020 And GLC-T Compatibility

May 27, 2012

The below nexus 5020 nx-os version and type/revision of my GLC-T is compatible with each other? I noticed also the "Transceiver calibration is invalid"  when i do show int e1/8 transceiver details , what does it mean?

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Cisco Switching/Routing :: Nexus 5020 - Fan Chassis Failed

Oct 24, 2011

I have an alert from monitoring system about: “ fan for this system is not in the NORMAL state”. In the switch I found that the problem is with fex 3, see below:
Nexus5020# sh env fex 3 fan
Fan Fex: 3:
Fan             Model               Hw         Status
Chassis     N2K-C2148-FAN       --         failure
PS-1           N2K-PAC-200W         --         OK
PS-2           N2K-PAC-200W         --         OK
 Technician said: fans appear to be operational, BUT the only thing that appears abnormal is STAT light is amber (not sure what it means).

Also, if I compare the temperature from module 3 with module 2 (which doesn’t have an alert) is almost the same, this is why I think the fan is working fine, since module 3 is not hotter that module 2.

What I can do to reset this fan (chassis)? 

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Cisco Switching/Routing :: 5020 / LACP Between Nexus 5K (VPC) And HP Servers?

Jan 22, 2012

I have two N5K (5020) switches with NX-OS - 5.0(3)N2(1). These two switches form VPC domain: peer-link = 2*10Gb ports (1/17-18) and peer-keepalive link over managements ports.Also I have two HP servers with two 10 Gb ports on each server.Each server conected by one link to each N5K switch (1/9-10). N5K downlinks configured as access ports with LACP Active mode.There is only one VLAN (1).When "no shut" command entered on N5K access ports - ports going in "not connected" status, begin flap and then going in "linkFlapErrDisabled" state.In attach - "sh run" from N5K.

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Cisco Switching/Routing :: VPC Configuration Between Nexus 5020 And 5596UP

May 6, 2013

We have two Nexus switches in our network, one of them is Nexus5020 other Nexus5596UP. System image is identical on both switches 5.2(1)N1(4). When we try to setup VPC between these switches we see that all configured vlans on VPC peer link  between Nexus switches are blocked by spanning tree protocol with message "Bridge Assurance Inconsistent, VPC Peer-link Inconsistent". We still can't solve this problem.

Member_link (Po100)     Member_link (Po100)                      

speed 1000
interface Vlan2000
no shutdown
description VPC_keepalive_link
vrf member VPC_kepalive
ip address

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Cisco Switching/Routing :: Spanning Tree Between A Nexus 5020 And Catalyst 6509

May 29, 2012

Our customer is willing to have a Cisco Nexus 5020 to provide server connectivity and this Nexus would go connected to their core switch 6509. They are concern about Spanning tree compatibility between the Nexus and the 6509. Are they fully compatible for Spanning tree?

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Cisco Switching/Routing :: Nexus 5020 Support Of HP Passive Twinax Cable?

Mar 3, 2013

I have a customer who is having some issues with 5m passive HP twinax cables, 537965-001, with a Chelsio 10G NIC.  Aside from NIC driver issue, if NX-OS recognizes this SFP+, should it be expected to work in a 5020 running 4.2(1)N1(1)? Whether Cisco has certified passive HP twinax cables?  I have included output to 'transceiver details' to a Cisco twinax and the HP (WL GORE) cables. 
Nexus5020# show interface eth 1/7 transceiver details
sfp is present
name is CISCO-MOLEX    
type is SFP-H10GB-CU3M


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Cisco Switching/Routing :: Nexus 7000 With Fabric Extenders Nexus 2000?

Mar 15, 2013

I have been tasked to replace the existing Cat 6500 and 3750 switches by Nexus 7000 and Nexus 2000.I was told initially my boss plans to get 2 x Nexus 7000 and then eventually blow up to 4 x Nexus 7000s.For Nexus, is there a list of tasks / points that i need to consider for building the initial design?
Can i just link the Nexus 7000 like the following?
N7k-A    =========   N7k-B
|                                   |           
lots of N2ks               lots of N2ks

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Cisco Switching/Routing :: Nexus FEX Transceivers SNMP MIB Nexus 5000

Dec 22, 2011

Struggle to find the SNMP MIBS of the Nexus 5000 FEX tranceivers.

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Cisco Switching/Routing :: Datacenter Design With 2 Nexus 5K And 4 Nexus 2K?

Nov 13, 2012

we are planning a Nexus datacenter project with this layout:Our experiences with Nexus switches are not so large until now and the manuals are very extensive.Both N5K´s should be connected directly with all 4 N2K switches. I did not find a layout like this in the manuals. Only a design,where only 2 N2K are connected to one N5K, with this fex config:Now I´m not sure if it is right to make a config like this with the same slots and fex´s or with different slots and fex´s.

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Cisco WAN :: -02 Will Not Work In Nexus 5020

Mar 22, 2010

I have two different model's of GLC-T SFP's.  One is PN 30-1410-02 the other is PN 30-1410-03. The -02 will not work in Nexus 5020 or an ASR-1000 router that I have, but works fine in my Cisco Wireless Controller.  The -03 works fine in any device. My problem is when ordering, you can not specify the -03  they get ordered as GLC-T and none of my suppliers can assure me that I would get the -03.What is the difference between these two?

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Cisco AAA/Identity/Nac :: Compatible Nexus 5020 5.0.2.N2.1 With Tac Plus?

Sep 10, 2012

I have a problem with the switches Nexus, is impossible authenticate from tac_plus. In other company, I configured ACS for authenticate the Nexus Switches and OK The configuration of my tac_plus is:
user = gian {
login = cleartext prueba
member = nexus
group = nexus {
default service = permit
service = shell {
#double-quote-values = yes
The configuration of switch is:
tacacs-server host xx.xx.xx.xx key 7 "xxxxx"aaa group server tacacs+ AAA_TACACS_SERVER    server xx.xx.xx.xx    source-interface mgmt0
aaa authentication login default group AAA_TACACS_SERVERaaa authorization commands default group AAA_TACACS_SERVER localaaa accounting default group AAA_TACACS_SERVER

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Cisco WAN :: Hardware Command To Verify Nexus 5020

Apr 23, 2013

What is the correct command to check the hardware of a Nexus 5020, like the show Inventori, show diag etc Used the same or is there a specific one for these items?

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Cisco :: LMS 4.0.1 / Nexus 5020 - Internal Error In Inventory Collection

Oct 10, 2011

2 Nexus 5020 (SysObjId 3.719) brings internal error in inventory collection as following:"RICS0001: Internal Error, unable to process the collected data from the device".whereby 2 other devices from same type, same sysobjid are working well. SDT from v401 shows this device as supported.

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Cisco Switching/Routing :: Nexus 7000 Keep Alive Link For Vpc?

May 5, 2013

We setup two n7K as core switches in our network. We configure VPc peer link as well successfully. We are using mgmt interface of supervisors as a peer keep alive interface, so what happen when this keep alive gets down? Are we loss Vpc peer link between both nexus 7 K?

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Cisco Switching/Routing :: Twinax For VPC Peer Link On Nexus 7000

May 5, 2013

Can you use twinax cables to connect two Nexus 7010 switches for VPC peer link?  They would connect on F2 modules and have Sup2 on the chassis.

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Cisco Switching/Routing :: Fiber Link Between Nexus And 6509 Not Working

Apr 27, 2013

I have the following connectivity :Nexus(7004) - M1 8Port card with  x2-10GB-SR <---------------------->  6509 -- 6704 card -- xenpak-10GB-SR  ,The fiber link is not coming up.

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Cisco Switching/Routing :: Nexus 4000I Port Channel Link Flap

Nov 8, 2011

We have a couple of IBM blade chassis with Nexus 4000I 10G blade switch in it. Four 10G ports from each Nexus 4000I switch are bundled into a port channel and connected to Nexus 7K. On the 4k end, one port in the port channel is doing down and coming up as an idividual port. After few minutes it is going down again and coming up as a port-channel member port. It is happening quite offen. [code]

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Cisco Switching/Routing :: Nexus 5548UP Change Peer Keep Alive Link

Apr 19, 2013

I have a pair of Nexus 5548UPs that have some high priority servers running on them.  Servers are ESX hosts running Nexus 1000v's.  Each host has multple connections in a VPC to both 5548s.  We have been having intermittant ping loss and slowness of traffic to the VM's on these hosts.  I was poking around trying to figure out what the issue could be and found that the peer-keepalive command was not set to send the heart beat across the mgmt0 interface.  I would like to change this to point it accross the mgmt0 interface. Any tips or advice for me on making this change with production servers running on the switches?  I do not want to cause any loss to any systems when I make this change. [Code] ..........

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Cisco Switching/Routing :: Nexus 5ks Connected To 6513s - Peer Link Active?

Mar 13, 2013

how the Nexus 5500s work ?currently we have two 6513 Core switches  6513-1 and 6513-2 running HSRP and RSTP.  6513-1 is currently the Root Bridge, 6513-2 is setup as our secondary root.  We also have two 5548UPs setup with a peerlink between them.    Picture attached. "Current Setup.jpg"
There is a 20gig port channel between the 6513s and also a 20gig port channel(peer link) between the 5548s. 5548-1 has a 10g fiber running back to 6513-1 and 5548-2 has a 10g fiber running back to 6513-2.  Currently now Spanning tree is blocking the link from 6513-2 going to 5548-2 which is what we expect.  We were working on moving some things to different racks the other day and moved switch 5548-2 to another rack and brought it back online without the peerlink fiber connected. We started to have issues and tried to plug the peer link back up, but still continued to have issues.  We started to troubleshoot and noticed that both 5548s were acting like the master of the VPC domain and was not letting traffic pass accross the Peer Link.  We then rebooted the 5548-2 with the thought that it would come back up as the secondary in the VPC domain.  When it finally finished booting back up it then caused a huge loop in our network accross both uplinks to the 6513s and the 5548s peer link which in turn took our network down.  Spanning tree did not work like it was suppose to and block the port going from 6513-2 to 5548-2 in time.
My thought was this didn't seem like a good setup.  I went to the drawing board and decided we needed to have an uplink from both 5548-1 and 5548-2 going to 6513-1 setup as a port channel/VPC and also a uplink from 5548-1 and 5548-2 going to 6513-2 setup as a port channel/VPC.  Picture Attached. "NewSetup.jpg"  We are also planning on buying a "2K-C2224TP-1GE" to hang off the 5548s to use for ethernet.
how the Nexus 5ks work and haven't done a lot of research on them. Would this not be a better setup since both switches will have an active link to the root bridge?  The links from the 5548s going to 6513-2 should always be in a block state until we loose both uplinks to 6513-1 or the entire switch itself correct?  Also how will the 5548s reactive if I was to loose the Peer link fiber?  Will they continue to work as normal?  When it looses this Peer Link does it suspend all the VPCs for the servers on the secondary switch in the Domain so the network doesn't get confused on which link to send traffic up since there isn't a peer link active or is this not the case?  Also with the peer link down will the 6513-1 know which 5548 to send the traffic to if there is only 1 device (not setup in a VPC) on one of the 5548s?  What are your recommendations/best practice on the setup for the 2k?

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Cisco Switching/Routing :: Any Function Built In Nexus 5010 To Detect Intermittent Link Down

Nov 23, 2011

I found intermittent link down(20~40 seconds average) occurred about 1~10 times every month. SAP reported a lot of active connections are disconnected and I used a batch to ping and found "requested time out" about 30 seconds.And Windows, SQL server, Nexus 5010 do not show any errors. We run cluster and cluster does not fail over.And I don't know which cables or nics cause this issue. When it happened, almost all servers are unreachable. For example, SQL server 1 -> SQL server 2, IBM HS22-1 -> SQL server 1. However, some connections are not dropped sometimes. It varies each time.PS: I run this topology last year without any problems but it started intermittent link down from 2011/1/7. Because there is no errors in Nexus 5010, it is difficult to troubleshoot. Cisco TAC recommended us to implement virtual port channel yesterday. Could I use "errdisable detect cause" to detect what caused the intermittent link down? Is there any error logs or switch parameters/status can use to troubleshoot?

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Cisco WAN :: Nexus 7K Ping Packet Loss

Nov 21, 2011

I am pinging a host from Nexus 7K.  I'm losing every 200th packet when I'm pinging the end host.   I don't see any issue with network connection.

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Cisco Nexus 4 - Ping Gateway IP / Getting Packet Loss

Nov 2, 2011

In my network i have Cisco nexus 4 switches those are running as redundancy and fault tolerance. I have mulitple VRF instances are running, when i tried to ping the gateway IP (hsrp Virtual IP) witch same VRF instance it is getting packet loss.

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Cisco WAN :: ICMP Packet Drop On Nexus 7018

Mar 9, 2011

I am running ping between two Nexus 7018 over WAN link ,and I can see some set pattern of packet drop(7.40 % drop) with MTU size 1500.When I ping between my 6500 VSS pair and same Nexus 7018 over different SP WAN link on diffrent location , I am still getting same kind of packet drop (8% drop) with MTU 1500. Has any one else come across this issue with Nexus?

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Cisco VPN :: 50226 ASA ESP Packet Discard Messages

Dec 8, 2012

we have a L2L tunnel between ASA 8.2.5 to Cisco Router. Recently we see tunnel is going down and shows messages in ASA about ESP packet discard. Below is the message.%ASA-7-710006: ESP request discarded from x.x.x.x to outside_int:x.x.x.At the same time from router the tunnel shows up but ASA not. We see CSCso 50226 which matches exactly with our issue.As a workaround we were resetting tunnel from router. It comes up and runs for a week.

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Cisco Switching/Routing :: 10G Ports On Nexus 7K?

Jul 2, 2012

I''ve trying to bring up ports on a N7K-M108X2-12L card using X2-10GB-SR modules.
All ports are in a VDC and configured to accept the M1 card:
vdc_id  vdc_name                          state               mac                 type        lc
------  --------                          -----               ----------          ---------   ------
2       cam-cor-csw-sfy-01                active              64:a0:e7:43:f0:c2   Ethernet    m1 f1 m1xl


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Cisco Switching/Routing :: 7010 - How To Add Two Nexus 5K In DC

Feb 18, 2013

This is regarding Nexus core switch 7010. We are already running two nexus 7K with ten Nexus 5k. Currently we are going to add two new Nexus 5k in our DC. In the 7K we already running two VDC's.

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Cisco Switching/Routing :: Nexus 5k High Fan RPM

Jun 8, 2013

The fans 1 & 2 in Module 1 on the Nexus5K are still experiencing the very high RPM and speed issue.
I have replaced the fan from another operational Nexus5K, and the fans are fine in the other Nexus. The replacement fans also have the same issues, so it is not a fan hardware issue.
There are no threshold alarms. the only log entry that is related to this is as follows:
%NOHMS-2-NOHMS_ENV_ERR_FAN_SPEED: System minor alarm in fan tray 1: fan speed is out of range on fan 1. 7950 to 12500 rpm expected. I have provided the output for both the fan detail and the temperature.
N5K-01# sh environment fan detail
Fan: --------------------------------------------------- Module  Fan  Airflow        Speed(%)  Speed(RPM)              Direction --------------------------------------------------- 1       1   


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Cisco Switching/Routing :: Per-VLAN QoS On Nexus 5K?

Feb 22, 2012

I was reading a QoS walkthrough earlier to try to solve my problem and I noticed that in IOS, you can specify "match vlan" in a class map.  This is not available in NX-OS. I'm not doing any routing on the 5K so I cannot match on ACL, and port where traffic is received is a trunk sharing other types of traffic I'd like to classify elsewise.
How can I match traffic on a per-VLAN basis?

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Cisco Switching/Routing :: How To Configure Nexus 5K

Oct 26, 2011

How to configure a nexus 5K?

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Cisco Switching/Routing :: Nexus 7k - Fex Not Loading

Mar 14, 2013

Just upgraded Nexus 7k from 5.2.1 to 5.2.7 (just system and kickstart image and NOT epld image). but after upgrading the one of the fex(n2k) dont seem to come online (this nexus 7k has two n2k and one of them came online and working fine)                  

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