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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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 ...
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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 ...
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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?
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4 votes
1 answer
333 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 ...
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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 ...
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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 ...
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1 answer
71 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 ...
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166 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 ...
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146 views

How can I do ERSPAN on Cisco Nexus 9000 for VLAN serment?

I need to capture traffic in local VLAN on Nexus9000K, start wireshark on my laptop, ip address of this laptoop is 9.9.9.9. Also I want to capture only icmp and src host 10.0.0.0/24. I try to do this: ...
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1 vote
1 answer
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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-...
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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,
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2 answers
217 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 ...
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2 votes
1 answer
107 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 ...
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3 votes
1 answer
81 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 ...
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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 ...
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132 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 ...
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1 vote
1 answer
126 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 ...
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1 answer
740 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 ...
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3 votes
1 answer
389 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 ...
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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 ...
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1 vote
1 answer
117 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 ...
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3 votes
1 answer
673 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. ...
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2 votes
1 answer
736 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) # ...
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3 votes
5 answers
184 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 ...
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2 votes
2 answers
322 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 ...
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1 answer
565 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 ...
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3 answers
487 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 ...
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1 vote
1 answer
75 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 ...
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2 answers
124 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 ...
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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] ...
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6 votes
1 answer
1k 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-...
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0 answers
67 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 ...
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0 votes
1 answer
352 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 ...
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-1 votes
1 answer
331 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 ...
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1 vote
2 answers
553 views

Cisco Nexus N9K-C92160YC-X kernel panicking at bootup and stuck in endless powercycle

I believe I have a bad Cisco Nexus N9K-C92160YC-X. I received this switch on loan from a customer with a blank configuration. I've recently learned that its warranty is expired and it's not ...
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1 vote
0 answers
70 views

VETH ports not working for cisco vIOS L2 devices (vios-l2 and nx-osv) using kvm/qmeu for virtualisation

Ok, so I've been toying with veth links for my Cisco routers and they have been working fine. However when you throw in a virtual switch like the Cisco nx-osv or vios l2 image, using veth interfaces ...
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1 answer
2k 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 ...
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1 vote
2 answers
3k views

Cisco nexus CRC error on interface

I have dual stack vPC setup between 4 cisco nexus switch as per above design. I have noticed recently that getting CRC error on cisco 3064 all 4 interface connected to N9K, and during peak traffic ...
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0 votes
1 answer
81 views

Filter Packet PPPoE Discovery

i have a sw nexus i have a router BGN with vlan 50 is going to sw then mode access to Client 1 and Client 2 BNG ==== SW1 == PORT1 =Client 1 (Mode access vlan 50) PORT2 =Client 2 (...
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0 votes
1 answer
312 views

can't find notify syslog in cisco sw nexus 3000

in cisco IOS i was used "Configuration Change Notification and Logging" but in cisco sw-nexuis i can't fine the commend SW-nex3000(config)# archive SW-nex3000(config-archive)# log config ...
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-1 votes
2 answers
490 views

How does one access the Cisco Nexus 5000 terminal?

How does one access the Cisco Nexus 5000 terminal? There is a console port on the back and connecting directly to it does nothing; does it require a supervisor module or something? Edit for clarity: ...
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2 answers
1k views

Fiber dBm transceiver power level at warning

We have cisco nexus 9000 and one of 40G interface showing port transceiver power level at warning when i check on command line i found following. Question: what is the normal power level for ...
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2 votes
1 answer
834 views

Is it possible to make a truly active\active L3 VRRP\HSRP configuration between two Nexus in a vPC

I'm an admin that is used to working with older Cisco gear, the Catalyst 6500 and the like. This is my first time diving into the world of nxOS. I'm trying to create a truly active\active ...
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0 votes
1 answer
37 views

sfp-25g-sr-s alternatives

I work at a media company and we have a room where we're essentially having a spine leaf topology implemented for our network. Now there's 4 spine switches and 6 leaf switches, the sfp we're using are ...
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1 vote
0 answers
473 views

802.1Q Tag mapping using Private VLANs on Cisco Nexus 3524

I'm struggeling with a VLAN mapping issue on a Nexus 3524 Switch. My setup: Downlink router<---Dot1Q 1901--->NX3524<---Dot1Q 493--->Uplink router I already figured out that basic 1:1 ...
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1 vote
2 answers
772 views

Cisco Nexus 7009 line card replacement

I have A nexus 7009 switch that is just running as a single unit with just routing and only admin vdc and one prod vdc and no vpc,fabric path etc used on it . My question is we need to replace the ...
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6 votes
1 answer
976 views

Cisco NX-OS 9K - LDAP Configuration

I'm having some trouble configuring LDAP authentication (via Windows AD) when connecting via ssh on our CISCO. I replaced some information from the switch, you will see it in uppercase here. ...
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1 vote
0 answers
634 views

Nexus OS IP SLA Object tracking

I have not configured IP SLA object tracking on nexus OS before and its looks a bit confusing. Can someone help me interpret the following configuration? This example shows that object tracking is ...
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2 answers
452 views

Cisco Nexus 5500 7.3.(3)N1(1) tcl script

Could anyone tell me why this tcl command isn't being recognized by this version of Nexus? someswitch-tcl# for { set i 1 } { $i < 10 } { incr i } { cli "ping vrf XYZ 10.xx.xx.$i" } ...
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2 votes
2 answers
887 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 ...
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