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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Connect Router 4431 to pair Nexus 9k

I have to made the following setup, but I’ m not sure that is works Before scenarios that works Router over one link L3 connects to one Nk9 switch. On the Router side I have multiple subinterface ( ...
0 votes
1 answer
2k views

SSH Config on Nexus Switch

Having trouble configuring SSH on 2 Fiber Channel Switches (NX-OS). Any Cisco experts here that can help? I am pretty new with Cisco and having trouble looking for documentation on SSH config for ...
0 votes
1 answer
519 views

Cisco Nexus vPC Portchannel issues

I'm currently facing a network issue between Cisco Nexus 93108 (9.3.11) on an LACP port-channel configuration. The replica below help us to reproduce the issue we had (using 4x Nexus 9000v qcow2 image ...
3 votes
2 answers
393 views

Looking for a sanitized Cisco NXOS configuration

This may sound a bit unusual, but I'm looking for someone who can answer with a sanitized NXOS configuration with the following features used: vPC FEX EIGRP, OSPF or ISIS (IPv4) HSRP or VRRP This ...
0 votes
0 answers
217 views

Cisco nexus 9336-FX2 ETHPORT-5-IF_DOWN_LINK_FAILURE

I am seeing following error on 100G interface. (SFP bought from fs.com) nxos version 9.3.10 2023 Oct 11 00:41:12 spine-1 %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet1/4 is down (Link failure) ...
1 vote
1 answer
108 views

Why are 10.3(99w)F and 10.3(99x)F NX-OS named like that?

According to https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/nx-os-software/guide_c07-658595.html#TypesofCiscoNXOSSoftwarereleases the part in brackets - "99w" and "...
0 votes
1 answer
2k views

Cisco NX-OS Factory Reset

An easy question actually. How do I do a Factory Reset on NX-OS? That means, how do I completely and permanently wipe all the configuration I've made without deleting the operating system image? There ...
2 votes
2 answers
4k 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 ...
0 votes
1 answer
95 views

cisco nexus qos vs control-plane policy

I have a pair of nexus 3064 and I want to secure their control plane but nexus series do not allow us to assign custom policy or class map to control-plane command thus I was thinking to use system ...
1 vote
2 answers
672 views

Breakout from 400Gbps to n*25Gbps

My servers are currently have 25Gbps NIC, but switch ( Cisco Nexus 9300 series) has only 400Gbps. I would like to be able to break out the 400Gbps connection into four 25Gbps connections. Is this ...
1 vote
3 answers
142 views

dynamic mac address added all hosts through the Do1Q tunnel

we have a nexus switch, we configure two customer ports in different switches with (mode Dot1Q tunnel) as all traffic must have two VLAN tags, an inner tag, and an outer tag, in our network, we ...
1 vote
0 answers
752 views

Nexus 7706 - switchport trunk allowed vlan not working - all VLANs are being allowed

I noticed that my two Nexus 7706 do not limit the trunk VLANs to what switchport trunk allowed vlan is set to. Sample configuration: interface Ethernet1/15 switchport switchport mode trunk ...
0 votes
1 answer
34 views

Cisco N3k ipv4 table size

I read n3k-c3064pq datasheet and it seems it supports 16k ipv4, i want to know when i add one route for example "ip route 192.168.0.0/16 172.16.1.1" then it will consume 1 of 16k ipv4 table ...
2 votes
1 answer
146 views

question about bypassing access switch

we have 2x Juniper QFX as access switch (In Virtual chassis mode) and we have 16x Rack, we have 1x 10Gbps sfp+ uplink to each juniper so each rack has 2x 10g towards 2x Juniper qfx access switch and ...
0 votes
1 answer
70 views

Is it risky to change hardcoded STP mLAG port cost on Cisco Nexus LACP port

When two Cisco Nexus are connected in VPC, the stp cost is hardcoded to 200 for the mLAG LACP ports. I would like to manually change the cost on my devices because my 2G and 200G links have the same ...
0 votes
1 answer
8k views

Port suspended (No LACP PDUs) nx 9k switch -> C220 m5 ucs

We are setting up 2 nx 9k switches with port channel (LACP) enabled so we can have multiple links for redundancy. The two links in questions is eth1/3 on both switches going to UCS MLOM ports. We are ...
0 votes
1 answer
59 views

Cisco 9396PX sFlow shows one direction traffic

Interface VLAN on Nexus 9396PX doesn't show Output traffic and also sFlow for outbound traffic. We have change TCAM to show sFlow but it still doesn't show Outbound traffic and shows only Inbound ...
0 votes
1 answer
63 views

What is "oc_usd" Process on Cisco Nexus 7k and how to solve

We have high CPU load on Cisco nexus 7K. The reason is "oc_usd" process. Anyone knows anything about the process and how can we solve the issue?
3 votes
5 answers
367 views

Cisco N9K - Down an interface in response to another interface going down?

I currently have my transit providers plugged directly into my router. I really like this arrangement because when the ISP goes down this typically downs the interfaces which results in BGP peering ...
4 votes
1 answer
2k views

How can I upgrade Cisco Nexus switch if not enough space for new image?

I have Nexus 92348GC-X units with 9.3.7 image version and I need to upgrade them, BUT not enoght space on this devices for new image upload (nxos 9.3.9) Moreover, I can't delete old image after I ...
1 vote
0 answers
246 views

MACsec encryption feature on Cisco NX-OSv 9000 Virtual Software?

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/nx-osv/configuration/guide/b_NX-OSv_9000/b_NX-OSv_chapter_01.html The above link only stated some examples of features which ...
0 votes
1 answer
153 views

How can I exactly find out what outgoing interface is using?

I need to identify what outgoing interface is using for some destination address. show ip route tells me several BGP routes to this destination, how can I exactly find out what switch's interface will ...
0 votes
1 answer
3k views

Cisco Nexus RADIUS authentication privilege issue

I'm trying to set up RADIUS authentication between a Nexus C93180YC and a Microsoft NPS Server. The RADIUS server is reachable and I'm able to log in and get permission granted, but the network role ...
0 votes
1 answer
292 views

Switch Port channel down but firewall did not log the port down event

Can some one help me here if I am missing anything to check. Issue: Our Palo Firewall got a vwire configured with interfaces eth1/5 & eth1/6. eth1/5 is directly connected to eth1/2 of cisco switch ...
0 votes
1 answer
638 views

Nexus Management VRF on same VLAN as LAN switches

1 Hi All. I searched this question but I'm not finding anything relevant, or I'm not understanding the results properly. I have all my L2 switches remote management access, SSH/SFTP, configured on a ...
1 vote
1 answer
53 views

replace power in nexus 7004 chassis

I have the following chassis : 1x N7K-C7004 with full powers and fan 1x N7K-F248XP-25E 2x N7K-SUP2 i want to know is there any difference in energy consumption if i use N7K-AC-6.0KW instead of N7K-AC-...
0 votes
1 answer
85 views

Cisco QSFP port to SAN(16G , 32G) Connection

Cisco has a Nexus 9000 model which supports FC. But all ports are QSFP, how can we connect FC to QSFP? Model: Cisco Nexus 9336C-FX2-E Switch Port: 36 x 40/100-Gbps QSFP28 ports Descriptions: The Cisco ...
1 vote
1 answer
56 views

VPC two types of nexus 7700

Can we VPC two types of nexus 7700 with each other? I mean , we want to VPC one Nexus 7710 with Nexus 7718. Does it possible ? Thanks,
2 votes
2 answers
1k views

NXOS DHCP Relay - overwriting Option 54 (Server Identifier) differently in DHCPDISCOVER vs. DHCPREQUEST?

I'm trying to sort a DHCP relay problem in a VLXAN/EVPN environment (Cisco N9K, NXOS 9.3.2). We seem to be able to get DHCPDISCOVERs through to the server and DHCPOFFERS back from there. DHCPREQUESTs ...
1 vote
2 answers
886 views

Can anyone please explain L3 SVI configuration ,What is SVI and Where do we use it?

I am learning about switching and came across SVI in vlans ,I Googled and watched couple videos and got really confusing Firsly where do we use Svi? and why do we use it,How to configure svi and what ...
2 votes
1 answer
217 views

Fabric Extender for Peer-Link on vPC domain (two Nexus 5000 switches)

I have two Nexus 5000 series switches. My question lies with the Peer Link. My intentions are to use e1/31 and e1/32 on both switches as the peer link. Here are the exact SFPs that I am using for ...
3 votes
1 answer
171 views

Cisco N3K-C3064 RACL question

I have a cisco nexus n3k-c3064pq-10gx and i want to have an acl and add 270x line (they will drop my interface vlan IP address because they are public IP), I want to know can I have this acl with 270x ...
0 votes
1 answer
483 views

Best practice for configuring sampler rate on Nexus 7000 for Netflow

Is there a best practice for configuring the sampler rate for interfaces that will be sending netflow data. I have tested on our Nexus 7000 with the mode 1 out-of 1000 on interfaces that are seeing ...
1 vote
1 answer
454 views

vPC between Cisco nexus 9236C and 9336C

I have a Nexus N9K-C9236C and I would like to add an other one to have redundancy with vPC fonctionnality (like describe here). The point is my suppliers don't sell this model anymore because it has ...
2 votes
2 answers
733 views

Cisco n3k-3064PQ-10gx TCAM problem

i have a n3k-3064pq-10gx and i want to have 1x pbr to change some 400x SVI next-hop , when i tried to apply the pbr to a l3 interface or SVI it says "% Could not apply PBR route-map - Specified ...
2 votes
1 answer
2k views

EVPN VxLAN arp suppression TCAM carving

Deploying Clos design network using leaf Cisco Nexus 9396PX and when trying to configure arp-suppression using tcam carving getting this error Free up tcam slice from VACL (default vacl tcam is 512) # ...
1 vote
1 answer
148 views

questions on nexus 3064

In most of times i have worked with Juniper switches but in some cases i should use some Nexus 3064PX series(48x sfp+) so i have some questions : as i remembered some switches such as 3750 has some ...
1 vote
1 answer
2k views

BGP over VPC on NEXUS

here is my network topology: i have a customer which is connected to my top of rack switch and my top of rack switch has 2x 10g LACP towards my both Cisco Nexus 3k and both of my Nexus 3k has VPC ...
3 votes
1 answer
662 views

TCAM carving question for Cisco Nexus 9396PX

TCAM carving question for Cisco Nexus 9396PX I have Cisco Nexus 9396PX and configure for IPv4 with IPv4 RACL on SVI to block some basic traffic. Now i have configured IPv6 and trying to configure ...
0 votes
1 answer
259 views

What prevents a device from receiving its own multicast stream, and can it be turned off?

I know that it is normally not possible for a device to receive its own multicast stream on the same network interface where it transmitted said stream. I also understand why this is sensible, and ...
3 votes
1 answer
2k views

BGP running on VLAN interface or loopback0?

The switches mention below are all Cisco. I got sw01 and sw02 running BGP peering with multiple service provider for our internal infrastructure, between sw01 and sw02 have a port-channel group 100. ...
1 vote
1 answer
286 views

sflow configuration Cisco Nexus 9396PQ

We have Cisco a Nexus switch with M12PQ 12x40G GEM expansion card. Today when i enabled sflow on one of 40G interface i got following error: # sflow data-source interface e2/12 In order to enable ...
0 votes
1 answer
2k views

Break sequence with Cisco devices

I am not able to send a break sequence from my HP pro book laptop to Cisco Nexus 9000 series switch over a usb adapter and Cisco console cable. I tried every possible button combination. I do not ...
0 votes
3 answers
1k views

Difference between N3K and N5K

I have 4-5m PPS and ~12Gb bps and around 650 interface vlan and each vlan has 3-4x prefix such as /29 or /28 and i have 6-7 bgp session with no full table and around 2000 IP routes with around 3000 ...
0 votes
2 answers
359 views

how to move configuration from one Nexus interface to another?

I am doing some cleanup on a Nexus switch I have (3048) and was wondering if there was an easy way to copy or move a configuration from one interface to another? When I move an existing connection to ...
0 votes
0 answers
154 views

Cisco CML 2.0 strange ASA trunking issue

I am seeing very strange issue and now i am losing my mind so thought ask you folk. I have following two components connected point to point on Cisco CML 2.0 [nxos-9000v]--------------------[ASAv] ...
6 votes
1 answer
3k views

NX-OS 9.3: ECMP polarization and "ip load-sharing ... rotate"

This is a "why and how exactly does this work" question. The given problem is already solved. QUESTION: I'm interested to understand what "rotate" in ip load-sharing address source-...
0 votes
1 answer
918 views

Use ECMP to distribute traffic between two paths, one learned by eBGP and one learned by iBGP on a Cisco NX-OS switch

I maintain two cross-connected switches, R1 and R2, which both have a link to an external switch, R3. R1 and R2 both use eBGP to receive routes to various subnets behind R3. Additionally, R1 and R2 ...
0 votes
0 answers
159 views

Data Center migration

We have two data centers in different locations and we want to transfer DC2 (secondary Data Center) from location Y to location X where X is DC1 (Primary) location. The connection between both data ...
-1 votes
1 answer
486 views

Port Channel issue on Cisco gear

I have a lab where I'm connecting a Cisco CSR1000V and a Nexus 9000 switch. These devices are connected back to back. Relevant configuration is: Router: interface Port-channel1 mtu 9216 ! interface ...