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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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16 views

Cisco NX-OS licensing

I'm somewhat new to networking and I have been looking to pick up an older Nexus switch to learn more about it and the converged features. I found a Nexus 3048 (for what I assume to be a reasonable ...
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2answers
64 views

Nexus 3172T MTU

I am attempting to set the L3 mtu on a Nexus port. The mtu option is only available if I set "no switchport" which then prevents me configuring VLAN related settings. Am I missing something obvious? ...
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22 views

Nexus 3K doesn't prompt to change password [on hold]

I'm working on Nexus 3K(3048, 3524) and several C6500 devices. They are all using TACACS+, and have to change password every 90 days. Today, I was tried to login Nexus 3K, and keep fails to login. So,...
3
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1answer
67 views

Cisco switch ports configuration with QSFP+ to (4) SFP+ Hydra Cable Assembly

I am connecting two cisco switches with QSFP+ to (4) SFP+ Hydra Cable Assembly. On one side I have Nexus N3K series switch with QSFP+ port and on other side I have 6500 series switch with SFP+ ports. ...
2
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1answer
27 views

QSFP BiDi 40GB with two LC-LC

This Cisco module QSFP-40G-SR-BD is Bi-Directional (BiDi) 40Gbps QSFP, which means a single link used for RX & TX, each link 20Gbps, two LC links in total gives 40Gbps connection. If we will use ...
2
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1answer
80 views

Multiple HSRP group on same VLAN interface

I have Cisco Nexus 9k switch and following is my HSRP configured with vPC interface Vlan100 description *** Public_1 VLAN *** no shutdown mtu 9216 no autostate no ip redirects ip address ...
3
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1answer
133 views

Cisco nexus 3048 SFP validation failed

I have cisco Nexus 3048TP switch (48x1G + 4x10G) Hardware cisco Nexus 3048 Chassis ("48x1GE + 4x10G Supervisor") Intel(R) Celeron(R) CPU P4505 @ 1.87GHz with 3665240 kB of memory. ...
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2answers
1k views

Cisco Nexus vPC LACP bonding with server issue

I am configuring vPC end to end till my server to get more bandwidth, and following is my scenario I am seeing one strange thing which is i configured vPC on N3k switch and then i configured my ...
3
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1answer
420 views

How to announce network to specific neighbor peer in BGP

I have following scenario where i already have 10G (A - BLUE Link) connectivity from ISP on SW1 and SW2 for redendency and i have configured eBGP and iBGP, Everything is good at this point, Now my ...
5
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1answer
158 views

How to resolve a spanning tree issue on a server trunk port?

I am having a very strange spanning-tree issue with Cisco Nexus switches. My server is connected to the TOR switch with trunk configuration because we have multiple VLANs on the server. When I reboot ...
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1answer
49 views

Why does this command fail ? Cisco Nexus5548

I'm wondering why the following command is invalid ? I don't have access to the switch, only to a read-only web-interface. It's a Nexus5548, and it does have an interface named "port-channel1". The ...
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1answer
166 views

ftp user in cisco nexus 5010 switch

How to create a ftp user in cisco nexus 5010 switch to archive for autobackup. Below command is working for normal switches like cisco c3850 but not for Nexus switches. Please advise #FTP Local User ...
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0answers
370 views

IP Glean rate limiter

I have two data centres connected via dark fibre DWDM with Nexus 7700's either side, between them running OTV. When I fail over an F5 LTM with about 3000 Virtual Servers on one DC to the other DC F5 ...
3
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2answers
261 views

Control plane terminology - Cisco Nexus

Is it true to speak about layer 2 control plane (LACP, STP, etc), and layer 3 control plane (OSPF, EIGRP, etc) ? or do we have only a general control plane ? We know Cisco Nexus vPC cluster has a ...
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2answers
1k views

Cisco ASA vPC configuration issue

I have this scenario and trying to configure vPC for Cisco ASA 5585 (Active-Standby) Nexus vPC config: interface port-channel1 switchport mode trunk switchport trunk allowed vlan 10 speed ...
1
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1answer
789 views

nexus ospf network statement missing

In old school IOS we used to do router ospf 1 network 0.0.0.0 255.255.255.255 area 0 But in Nexus switch i am not seeing any command or related doc, how do i announce my subnet in ospf in nx-os My ...
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1answer
388 views

Cabling two access ports on the same switch from different VLANs

Theoretically would I be able to connect two switch ports together with a simple straight/cross cable on the same switch. If the two ports are in different VLANs (eg. 2 and 22) and ports are in ...
3
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2answers
407 views

vPC traffic flow question

This is going to be new network in my datacenter and i have question related vPC, as you can see i have A1/A2 switch (L3/L2 routing) in aggregation layer and C1/C2 switches for Core (L3 routing). I am ...
2
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1answer
83 views

Routing the same prefix to different destinations on the same router

I have a Cisco Nexus 7000 and have configured static routes to reach my internal networks on the Nexus 7000. During a DDOS attack, the Nexus 7000 receives a more specific route via IBGP to re-route ...
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2answers
136 views

Nexus 9396px FAN speed issue

When i load nxos.7.0.3.I2.2d.bin Software then FAN running very quiet in following speed switch# sh environment fan detail Fan: ------------------------------------------------------------------------...
2
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1answer
77 views

Juniper JunOS routing issue in v15.1.49

I have a Cisco Nexus that has a few vlans on it - total network size is 172.26.64.0/20 split into /24 vlans - each using the third octet as the vlan ID. It's IP is 172.26.x.254 on each vlan as the ...
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1answer
107 views

Cannot Access remote VLAN from LAN

My WS-650E is connected to the Nexus 5000 as described in the image. The Nexus has a 10G P2P link to remote Site on 172.16.1.0/24 subnet. There is no router between the 2 sites and the IP on the ...
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0answers
212 views

Cisco Nexus 7k Mac move

I have been troubleshooting a mac move behaviour on my core network, which is made of 2 Nexus 7K with F3 series modules. They are inter-connected with a fabricpath mode port-channel. All the remote ...
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2answers
219 views

Nexus 3064 strange CPU utilization

My SNMP monitoring showing Nexus 3064 switch CPU utilization 20% But on switch cpu history showing 72 Hour maximum CPU%, is this normal? # show proc cpu history 1 1 11 1 1 11 111 11 ...
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1answer
183 views

Cisco VRF with two ISP

I am posting this question to get better understand of VRF on Nexus switch. This is the scenario i have 10G_A link from my ISP running BGP on it, now i need more capacity so order second 10G_B link ...
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80 views

Nexus 7k Local Switching

I have a Nexus 7k that's playing a PE role, and I am trying to do EVC local switching on it the problem that I am facing is that Nexus doesn't support local switching. Note: The port has to be a ...
2
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1answer
56 views

ACL on Nexus 3064PQ performance

We are using this switch as L3 and planning to run some ACL to stop bad traffic. I never run ACL on switches so wondering is there any performance impact or how bad it will be? if anyone has any ...
2
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1answer
278 views

Cisco Nexus C9396PX licence question

We have Cisco Nexus C9396PX and i want to run HSRP on this to do failover, I just looked at licence and its showing following does that mean switch has activated Layer 3 license? switch# show lic u ...
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1answer
156 views

Network design question for datacenter

We have new customer and they said their traffic requirement is ~40GB so i am planning to order some hardware and have some question or doubt in mind. I am planning to put Nexus 5000 for Core layer ...
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0answers
139 views

Cisco Nexus (nxos.7.0.3) mpls feature shows only static

I've been bumping my head for couple of days. I have two L3 switches (Cisco Nexus, with OS: nxos.7.0.3). On one of them Sw1: sh feature-set services mpls ulib mpls_static mpls_oam mpls ldp 5 ...
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1answer
1k views

Nexus VPC Peer Link - does it carry unicast traffic?

Read from the doc that the VPC peer link only carry multicast/broadcast traffic under normal circumstances -> The vPC peer link carries control traffic between two vPC switches and also multicast, ...
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2answers
665 views

Configuring ACL for DNS

Just want to double check my work here, but the domain port is supposed to be specified with the actual DNS server, correct? I want to only allow the VLAN 5.5.5.0/24 to communicate with this server ...
3
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1answer
405 views

VXLAN on top of EIGRP/I-BGP

for labbing purposes, I have two NX-9000 that's connected to each other via EIGRP. Trying to have one as Spine switch and the other as Leaf switch. No redundancy/HA needed at the moment Could you ...
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0answers
107 views

monitoring Nexus 3548 BGP session via SNMP

I am implementing a SNMP-based monitoring solution on a nexus 3548 platform to be alerted when the number of routes received from a BGP peer changes. Does anyone know which OID can I use? Thanks guys. ...
1
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1answer
360 views

Provide L3 gateways in a multi-tenant VXLAN environment with ASR9K and N9K

I'm trying to make a PoC about VXLAN, and I have a design issue. I have one c3750 per client, each 3750 is connected to an N9K with a single fiber (per client). So each N9Ks are connected to multiple ...
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0answers
35 views

Upgrade NK5 IOS

I'm planning to upgrade 2 NK5 IOS, from Version 7.0.2.N1 to 7.1.4.N1. Is it possible to upgrade 1 Switch and let the other one running with the old IOS? They are completely redundant, I want to ...
3
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1answer
152 views

Tapping Nexus 5k FEX uplinks

Very similar to this question, we are considering tapping the FEX uplinks that we have running from Top Of Rack to our Nexus 5k core switches. Has anyone had success with tapping those uplinks? I ...
2
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1answer
146 views

Why does a layer 3 hop use vrrp secondary on nexus 6001

I have a nexus N5K-C5672UP as core layer 3 for our VLAN's. VLAN 601 on core 2 is secondary vrrp: core 02: core02# show vrrp Interface VR IpVersion Pri Time Pre State VR IP addr ---------------...
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2answers
617 views

What is Interface's Nominal Bitrate?

If you check show int tranceiver command on Nexus Switch 10Gbit Ethernet port, the output shows the nominal bitrate is 12000 MBits/sec instead of 10000 MBits/sec. As I know 12 bytes Interframe Gap + 8 ...
2
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1answer
1k views

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
525 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 ...
3
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1answer
65 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 ...
3
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1answer
143 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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2answers
674 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
1k 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
759 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
199 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
296 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
1k 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
2k 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 ...