Cisco Switching/Routing :: Nexus 7000 Span Limitation

Apr 18, 2012

I've learned recently that the Nexus 7000 only allows the configuration of a maximum of 2 Monitor sessions for spanning traffic. I only have one monitor session left and I need to do the following. 2 Core Nexus 7000 boxes with 2 different traffic probes/sniffers to each nexus( eg Sniffer 1 connects to Switch A on interface eth 1 and to Switch B on eth 1 ; Sniffer 2 connects to Switch A on eth 2 and to Switch B on eth 2.) My plan was to setup a standard session with multiple sources and destinations then on the interfaces connecting to the sniffers run a trunk and do 'sw trunk allowed xxxxx' and filter what I need to go to each sniffer box. However I've recently found out that some of my source traffic is coming from Port-Channel interfaces. Is there a way I can get around this and still do the filtering within only 1 monitor session ?

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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 :: 6509 - Nexus And Span Sessions

Oct 24, 2011

I am in the early planning stages for a 6509 to Nexus 7K migration. Based on my experience with the 7K's at a previous company where we ran into a lot of issues, I am trying to be very careful.
 
I am more at home with the 6500 chassis and know what I can do with them.  I remember running into a limitation on the Nexus that involved their not supporting span sessions like the 6500's do.  Is that still the case ? 
 
If that isnt an option in the short term, I will need to look at a substantial investment in ethernet tap's to replace the lost span functionality because the security group's heavy use of span sessions.

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Cisco Switching/Routing :: Nexus 7K (6.x) / SPAN To Multiple Destinations Does Not Work

May 18, 2013

I have a single Nexus 7K (6.x) with only F2 modules and I would like to SPAN the same source interfaces and vlans to mulitple destination servers (interfaces).  When configuring SPAN to a single destination traffic gets replicated successfully but when I add an additional destination to the same SPAN session then none of the destination interfaces receive any traffic.  As soon as modify the SPAN to include only a single destination interface it works again.  I'm guess this is a limitation of the Nexus 7K 6.x code or the F2 modules. 

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Cisco Switching/Routing :: NEXUS 7k Span Session Getting Twice Data To Port

Jun 9, 2013

I'm setting up a montitor session on a NEXUS 7K as below.we are receiving in 150M of data and 0 data going out port 9/25.but port 4/24 shows 300M to the span port?

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Cisco Switching/Routing :: How Many VLANs Can Span In Monitor Session On Nexus 7K

Mar 3, 2013

rsbd7k01-p-vdca(config)# monitor session 2
rsbd7k01-p-vdca(config-monitor)# source vlan ?
<1-3967> 
rsbd7k01-p-vdca(config-monitor)# source vlan 1 - 3967
ERROR: vlan 33-3967: Number of source vlans exceeds maximum
rsbd7k01-p-vdca(config-monitor)#

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Cisco Switching/Routing :: Nexus 7010 Span Picking Up Multiple Device Uni-cast Packets

May 29, 2013

I want to monitor our backup server (commvault) as it is saying it's library (Data Domain) is going off line.[code] The issue is I am seeing a lot of unicast traffic (on Wireshark) that has nothing to do with the server on E2/11.  Some of it is from different VLANs... There is way too much data (multi-Mbps) to keep wireshark running very long to capture our intermitten problem.

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Cisco Switching/Routing :: Nexus 7000 Vrf Not Enabled?

Dec 9, 2012

Should I install any special license to enable vrf within Nexus 7000 VDC? I observed that vrf routing instance is not enabled in the VDC.

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Cisco Switching/Routing :: NTP Authentication On Nexus 7000?

Mar 3, 2013

I am configuring NTP on a new Cisco Nexus 7000 running version 6.1(2). NTP is working properly between the access switches and Nexus, however when configuring Authentication, NTP is not working anymore.
 
confguration:
 
Nexus 7K server
============= 
ntp server x.x.x.x
ntp peer q.q.q.q
ntp server e.e.e.e
ntp server r.r.r.r
ntp source-interface  Vlanx

[code]...
 
why NTP authentication is not working !!!!! on Nexus 7000

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Cisco Switching/Routing :: FIB Inconsistency On Nexus 7000

Aug 3, 2011

On a 7K (5.0(2)), I have a situation where the FIB and RIB are out of sync.  I'm not sure it's causing a problem, but it's been implicated in some weird packet loss issues.  It seems like it could cause network issues if you had two routes in the RIB, only one in the FIB, and then you lost the single path in the FIB. How the RIB/FIB gets out of sequence, how to proactively know about it (nothing in the logs here), and whether or not this is a big deal or a red herring?
 
Here's sample output that illustrates the RIB and FIB being out of sequence.
 
ROUTER1# show ip route 172.16.100.1
IP Route Table for VRF "default"
'*' denotes best ucast next-hop

[Code].....

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Cisco Switching/Routing :: Support For FeX 2232TM In Nexus 7000?

Feb 2, 2012

We recently purchased a pair of 2232TM Fabric eXtenders just to find out that our Nexus 7000 does not support it. Will there be support for the 2232TM FeX in Nexus 7000 any time soon?

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Cisco Switching/Routing :: Nexus 7000 OTV With F1 Line Cards?

Jul 17, 2012

I have two data centres connected via a L2 DWDM, my manager wants to look into using OTV to get rid of the layer 2 broadcasting issues.
 
Problem is the DWDM is 1000BaseSX, which is only supported on the N7K-F132XP-15.   (and the N7K-M148GS-11 but that doesn't support FCOE, so many bloody caveats). From what I can gather OTV is not supported on the N7K-F132XP-15.
  
Is it possible to terminate the DWDM on the F1 card & loop another port from the F1 to a port on the N7K-M148GT-11 & run OTV on the M1????
  
Either using VDCs or just an isolated VLAN on the F1. Is there any better way to do this? Hardware has not yet been purchased.

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Cisco Switching/Routing :: Nexus 7000 Vdc Vlan Configuration?

Dec 9, 2012

I am seeing an issue that after deleting/recreating one of the VDC in Nexus 7K, VLAN is not been able to be configured within the VDC although it is not actually a reserved VLAN. Could it be anything missing in the license installation? the version of the image is NX-OS 6.1.2
  
StorageVDC(config)# vlan 100
^
invalid vlans (reserved values) at '^' marker.

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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 :: Nexus 7000 QoS Marking For Both DSCP And COS

Jan 29, 2012

I have a pair of Nexus 7K's running 5.1(3). I have a handful of edge devices that I need to mark ingress traffic, and need to mark both DSCP and CoS. Right now, I have a working config that marks DSCP appropriately.While that works dor DSCP, the MQC will not allow me to mark both DSCP and COS in the same class, and unlike IOS, it appears that Nexus does not have a default DSCP-to-COS mapping. My understanding is this can be solved using table maps, but I don't see how that can solve my problem in this specific scenario (it appears I can do marking or table-map mutation, but not both?). How I can accomplish both?

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Cisco Switching/Routing :: Nexus 7000 Cannot Get AAA Authentication To Work

Dec 5, 2011

I cannot get the AAA tacacs+ authentication to work on my Nexus 7000.

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Cisco Switching/Routing :: Nexus 7000 To Know Ambient Temperature

Nov 2, 2012

I need to know how is the ambient temperature for the Nexus 7000 switches to plan a new datacenter. In the datasheet I found the following information regarding this topic:"GR-63-CORE Network Equipment Building Standards (NEBS) specification published by Telcordia Technologies in Section 4.1.2". How are the specification for temperature in this standard?

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Cisco Switching/Routing :: QOS For VOIP Traffic On Nexus 7000

Mar 4, 2012

regarding QOS on Nexus 7000. Our Nexus 7000's form a collapsed distribution/core layer, our access layer switches are are a mixture of Cisco 3750 & Cisco 4507. 3750 switches will connect to Nexus switches via 1Gb uplink, 4507 switches will connect via 10Gb uplinks. Each Nexus will be connected via 20Gb port channel, all servers connect to the Nexus switches via 1Gb links. We're implementing a new telephone system soon which will be using VOIP so I need to configure the switches to perform QOS. The IP phones will mark the RTP traffic with DSCP value EF and call signaling traffic CS3. I'm fine configuring qos on the access layer switches, its just the Nexus switches which I'm not sure about.
 
Do I actually need to configure any QOS parameters on the Nexus switches so they will prioritise the VOIP traffic. If my understanding  the Nexus switches will trust the DSCP values and assign the traffic to the relevent queues?
 
Just for information VOIP is the only traffic I will be marking QOS values

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Cisco Switching/Routing :: Nexus 7000 Bandwidth Control

Oct 14, 2012

On Nexus 7000s I want to limit bandwidth of particular IP. I can do this using proper configuratio of IP ACL, policy map and class map. But what if I dont have information on interface?  Can I apply bandwidth control for particular IP without knowing the interface?

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Cisco Switching/Routing :: Nexus 7000 And 2000 FEX Support With VPC

Apr 20, 2012

if vPC is supported between a single 2232PP FEX and two 7000 switches running 6.0(1)? I have been researching this for an implementation I am doing for a client and was able to determine it was not supported with earlier versions of 5.0 when the FEX is connected via vPC as I described above, but I can't find anything related to version 6.0(1). I have done this for other clients with 5000 and 2000 switches, but I don't have too much experience with 7000 switches.

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Cisco Switching/Routing :: Nexus 7000 Log Entry Explanation?

Dec 4, 2011

I have some error messages in the Nexus 7000 log, after searching i cannot find an adequate explanation, pretty much the only thing i can find is below and i don’t think it is very relevant to my situation. The device is in production and so reloading and pulling card willy nilly is the last resort.

Device = Nexus 7018
IOS version = 5.1(2)
Log messages=
2011 Dec  2 14:52:35 IAS01LVSWIPC01 %OC_USD-SLOT8-2-RF_CRC: OC2 received packets with CRC error from MOD 6 through XBAR slot 1/inst 1 and slot 2/inst 1 and slot 3/inst 1

[code]....

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Cisco Switching/Routing :: Nexus 7000 / Configuring Jumbo MTU?

Nov 17, 2011

I have a Nexus 7000 plus 6 boxes NX2000 on backbone.I have configured on 7000 :
 
conf t
system jumbomtu 9000
exitERROR: Ethernet111/1/1: requested config change not allowed
...
ERROR: Ethernet122/1/48: requested config change not allowed
1/111/14 is a NX2000 port conf tinterface ethernet 1/111/14 switchport mtu 9000 exit

I have gotten this message : Error: MTU cannot be configured on satellite port(s) - Eth122/1/11 ?I have tried on a NX7000 TP port:ERROR: Ethernet10/45: MTU on L2 interfaces can only be set to default or system-jumboMTU ?Does JUMBOMTU configuration can be done only when there are no NX2000 configured ?

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Cisco Switching/Routing :: How To Configure IP Helper In Nexus 7000

Jan 30, 2011

I'm interested to know whether we can configure ip helper in nexus 7000?

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Cisco Switching/Routing :: Nexus 5500 / 7000 - Dependencies On VTP

Jun 26, 2012

Are there any dependencies on VTP on the Nexus platforms like the 5500 or 7000? In IOS P V LAN required VTP Transparent mode however I cannot find any reference to this for the Nexus platform. Are there any other features that would require the use of VTP? By default VTP is turned off on nexus and has to be enabled with the feature command so is there any benefit to running VTP in transparent mode vs off?

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Cisco Switching/Routing :: Dedicated Mode On Nexus 7000?

Feb 22, 2012

i like to configure two ports in dedicated mode (eth4/1 + eth4/2).the ports are on a modultype "N7K-F132XP-15" (32x10GE)all ports are in one vdc membership (default configuration)
 
ive tried this for port eth 4/1:
bciscon7k01(config)# int eth 4/1,eth 4/3,eth 4/5,eth 4/7
bciscon7k01(config-if-range)# shut
bciscon7k01(config-if-range)# int eth 4/1
bciscon7k01(config-if)# rate-mode dedicated
 
after that i get the following message:"Ignoring command for interface Ethernet4/1 as rate-mode is fixed." i didn't find any documentation to this error message.whats wrong in my configuration?

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Cisco Switching/Routing :: Nexus 7000 Errors Every 30 Seconds

Feb 3, 2013

I have a Nexus 7000 pair with Etherchannels connecting to various access switches. 2960's and 3750's.The access switches channel 2 ports together. LACP active mode. One link goes to one Nexus and one to the other. Those connections are a portchannel with vpc configured.Every 30 seconds on every interface connecting to one Nexus I see a FCS error. The errors increment at the same time every 30 seconds. Only on one port. If I shutdown that link and keep the channel up on the other link the errors move. No shut the interface and they move back.This must surely be some Nexus generated packet that the access switch does not recognize/ what is likely to be getting sent at 30 sec intervals to all Channel members on one link ?

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Cisco Switching/Routing :: Nexus 2000 To 7000 Connection

Jan 13, 2013

If the latest release of NX-OS 6.1.2 supports dual homing a Nexus 2000 to a pair of Nexus 7000s (F2 Module)? The document does state something about support for vPC+ but is not really clear about it.

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Cisco Switching/Routing :: SFP Showing Unknown On Nexus 7000

Mar 9, 2013

I have couple of SFP and most of them are working fine except this:-
 
Nexus7000# show interface ethernet 6/31 transceiver details

[code]...
 
a) What is the reason this is not getting recognized?
 
b) Is theSFP SFBR-5766PZ-CS1 plug and play in the 7000 Nexus?

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Cisco Switching/Routing :: Future IP Sla Support On Nexus 7000

Feb 21, 2012

future support for IP Sla on the nexus 7000. The latest info that I've seen is that it will/could be supported in release 6.2, scheduled for mid 2012. Does this still accurate?

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Cisco Switching/Routing :: Port Allocation In Nexus 7000

Mar 4, 2013

I have one cisco Nexus 7000 with version 6.1(2).I created 3 VDC
 
ADMINCOREsecurity
 
I have configured 1 - 45 ports for Core and 46 - 48 ports for Security.Now I am not using the VDC Security and I tried to move the assigned ports 46 - 48 from Security to ADMIN.Switch accepted the command .But the ports are not visible on ADMIN VDC.Now it is not showing on Security VDC also. I need this ports in ADMIN VDC

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Cisco Switching/Routing :: Nexus 7000 EPLD Upgrade

Jan 3, 2012

i need to do EPLD upgrade. on a couple of Nexus 7000 with only 1 10Gb card per Switch and 2 peer-link on this card. Can you tell me what's happening when the 10GB card on the vpc secondary role Switch will be EPLD upgraded.

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Cisco Switching/Routing :: Nexus 7000 Two Servers In Different Location But On Same Subnet

Mar 15, 2013

I have forgot this technology name, but, I remember it can achive on between Nexus 7000s in two location, and also between two catalyst 6500.Can I ask if it can be done between one nexus and one catalyst 6500?

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Cisco Switching/Routing :: Multiple VPC Domains On A Single Nexus 7000?

Nov 13, 2011

I have a customer with three rooms where teh access layer aggregation switches are run back to.
 
Access Switch Stack A -> room 1 + room 2
Access Switch Stack B -> room 2 + room 3
 
Is it possible to have three Nexus 7000s ie one in each room (1,2 and 3) and have them setup like this:
 
Nexus 7000#1     vPC domain 1
Nexus 7000#2     vPC domain 1 + vPC domain 2
Nexus 7000#3     vPC domain 2
 
Thus gving all access switch stacks redundant links to the core withouit spanning tree.
 
I know its not ideal but its a campus site and thats how the existing fibre runs go.

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