Questions tagged [cisco-nexus]

For questions about the Cisco network product line, called Nexus. For instance, Cisco Nexus 3000, 4000, 5000, 6000, 7000 and 9000.

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DHCP not working on clients connected to Nexus 3048 but works on SVI

I've a strange problem with a pair of Nexus 3048 Switches in a vPC configuration. Since the core are still under implementation we've hit an strange issue: clients can't get IP addresses from the ...
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1answer
1k views

Cannot enable Flow Control on Cisco Nexus 3048

I've a pair of Nexus 3048 running NXOS version 7.0(3)I2(2d) and I can't enable flow control on ethernet interfaces. When issuing the command: flowcontrol receive on it returns with: ERROR: This ...
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1answer
109 views

Adding 2nd EIGRP route to Data Center

I am adding a 2nd layer 3 link between data centers using EIGRP. I want the remote sites to continue to use the 100 Mb to routes that are in Data Center 2 (unless the link is down). If I'm correct ...
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1answer
428 views

Mirror traffic from few interfaces in nexus 3000 switch to 2 interfaces for IPS

I need to be able to mirror traffic from 4 ports on Cisco Nexus 3000 switch to 2 ports on a same switch and connect 2 IPS appliances to those 2 ports. But I don't think it is possible to mirror port ...
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1k views

How long of an outage for ISSU Nexus Upgrade?

I am in the progress of doing ISSU upgrades on some nexus 7710 chassis' with dual supervisor modules. I set a ping test that to traverse across the switch shortly before the upgrade and experienced ...
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2answers
3k views

Netflow vs sampled netflow

I'm working on a project where I could need Nexus 5600. These switches support sampled netflow and not netflow. I would like to use netflow to do stats and to analyze trafic at some specific times. ...
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1answer
1k views

Gateway on Nexus 3500 with VPC

I am testing a setup with 2 Nexus 3524 and a 2960X in a VPC Topology : For this test lab, I miss some SFP so there's only one physical link between each switch (and those link are copper using ...
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1answer
403 views

applying licensing to Nexus 5k

I'm running a pair of 5596Ts as a vPC pair. These make up the core in our DC, all L3 is handled here (daughter card installed), all subnet gateways live here, using HSRP across them all. Our current ...
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1answer
1k views

SSH access to router via inband and OOB ports

I am aware of management VRF where inband port and OOB port on router can be part of and support SSH access to the router from both management port and network port. In this case inband port(network ...
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1answer
2k views

understand "switch-profile" for Nexus 5k switches

Am I correct that if there is no switch-profile configured for pair of Cisco Nexus 5k switches, then conf sync does not work regardless that CFS(Cisco Fabric Services) is enabled over management ...
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1answer
5k views

default interface cmd on cisco nexus 5k

Does anyone know of an equivalent "default interface X" comand for the Cisco Nexus 5000 platform? switch>en switch# conf t switch#(config)# default interface x -> dead thread here about the ...
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557 views

NTP architecture questions

I have a question about NTP. We want to setup our core switches as NTP master for our network. We have three data centers. Site A : Two Nexus as core Site B : two Nexus as core Site C : two 6800 (in ...
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2answers
256 views

Applying a queuing service policy

This is on a Nexus N5624Q. I have this TA-queuing service policy : policy-map type queuing TA-queuing class type queuing queue-cos1 bandwidth percent 20 class type queuing queue-cos2 ...
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1answer
2k views

Removing source ports from a SPAN session on a cisco nexus switch

So, I have built a tool that allows users to configure SPAN sessions on a Cisco switch. I'm currently trying to get the application to work for the Nexus series but there is one command I'm not sure ...
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635 views

Port-Channel Interface Configuration EtherChannel and LACP in same Port-Channel

I currently have two links which form a Port-Channel from 1 cisco device to another. I want to change the port-channel config from channel-group 1 mode on to channel-group 1 mode active So that ...
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2answers
1k views

Communication between VDCs on Cisco Nexus 7000 via virtual interface

Is there any way to create a virtual interface of sorts between two VDCs on a single Nexus 7000 switch? I've read that a physical cable is required (which is lame) however I wasn't sure if this was a ...
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2answers
387 views

UDLD on Nexus 5548 and Nexus 2232

Do you know if I turn on UDLD the 5K and 2K will speak UDLD to each other and do you feel this is a benefit to detect any link issues between the 5K and the FEX? Thanks
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1answer
1k views

intervlan router-on-stick with Nexus

Ok people, same drill on router-on-stick inter-vlan routing between a Cisco router and Cisco switch. Except this time, it's the expensive Nexus instead of Catalyst. 2911#show vlans Virtual LAN ID: ...
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2answers
1k views

Nexus 7000 - switchport Voice configuration

Nexus 7k NXOS 6.2(8a) I am trying to configure a voice vlan but the command does not seem available? Is there something I am missing to enable that? interface Ethernet4/1 description ...
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1answer
176 views

Monitor which SNMP communities are still in use

I am migrating from SNMP community1 to SNMP community2 on a NEXUS switch (plus a bunch of 2960s). Is there a way to monitor that the old community is not used anymore?
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1answer
463 views

vPC over Dark Fiber

Recently, I was asked to implement vPC connections over Dark Fiber between two data centers. Is this possible, and, if it is possible, does it have any drawbacks or limitations? I'm asked to encrypt ...
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2answers
2k views

Nexus 5500 FEX Support

This design guide on networkcomputing.com states the following: When uplinking to Nexus 5Ks, one topology option is to dual-home the physical Fabric Extender. Dual-homing a FEX provides path ...
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2answers
876 views

Cisco OTV vs L2 VPN

Cisco introduce OTV as solution to give two physical separate Data centers l2 connectivity over common L3 network , so why we need that if we have L2 VPN solution ? and what is the benefits of ...
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1answer
2k views

How to copy an image to a corrupt bootflash?

Hi i am trying to copy an image from my ftp server onto a nexus 3500 switch (N3K-C3048TP-1GE) but the switch will not let me access the bootflash at all, is there anything I can do to recover the ...
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1answer
4k views

Cisco Nexus 7k as NTP server

Anyone have experience with setting up their Nexus 7k core as an NTP server? I was thinking the code would look like below: ntp master stratum 2 ntp server ns.arc.nasa.gov prefer ntp server bitsy....
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1answer
9k views

interface showing "Link not connected" on a Nexus 2200 FEX but it is very much connected

I have to be over looking something dumb here but I can't figure it out. The fex is set up properly and is communicating to the Nexus 5548 without issue. There are a few other fexs connected as well. ...

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