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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31 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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4answers
67 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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1answer
41 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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1answer
22 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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3answers
69 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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1answer
37 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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2answers
32 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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0answers
22 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] ...
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1answer
92 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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0answers
22 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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1answer
31 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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1answer
58 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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2answers
63 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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0answers
21 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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1answer
153 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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2answers
456 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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1answer
36 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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1answer
53 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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2answers
57 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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2answers
136 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 ...
2
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1answer
169 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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1answer
32 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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0answers
131 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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2answers
241 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 ...
6
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1answer
372 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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0answers
180 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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2answers
274 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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1answer
295 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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0answers
495 views

How to check vlan interface traffic on Cisco nexus 9k

I have Cisco N9K-C9396PX L3 switch which has VLAN interface configured for my LAN gateway and i want to monitor how much traffic vlanXXX handling, I have configured SNMP monitoring to pull interface ...
4
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1answer
492 views

Cisco Nexus 9300 TCAM carving

I have Cisco Nexus C9396PX L3 switch and i have configured bunch of ACL (inbound) on it to deny/permit traffic. now if i am trying to add more ACL then getting error that your TCAM table is full. here ...
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2answers
92 views

Cisco Catalyst 9410 - Using Default Gateway versus ARPing for locally connected host

I may be missing something extremely simple here, but im at loss trying to figure out what this Nexus switch is doing. Here is the topology: DISCLAIMER! I had made a mistake on the diagram by ...
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1answer
72 views

N2K-C2248TP-1GE question

We are working with Cisco 2960 and Cisco 4948 switches as our top of rack switches and we want to purchase some N2K-C2248TP-1GE , and connect N2K-C2248TP-1GE to our edge switches, (our edge switches ...
0
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1answer
910 views

Devices in same vlan cannot ping each other - ARP Issue [closed]

The environment is running with Nexus 9K in NXOS mode. Both are in vPC mode and running hsrp with N9K1 active and N9K2 standby. Due to vPC both nodes are running Active/Active for HSRP. Now the ...
2
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1answer
2k views

Cisco N9K Output Discards

We're experiencing output discards in couple of our N9K-C9372PXs. Seems like egress queues fills and it ends up in a lots of discarded packets. All interfaces where discards occur are NEXUS ...
2
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2answers
295 views

BGP multi-path using loopback

I have above scenario where i have multiple PATH for my BGP so i have to setup loopback interface to make it ECMP routing on both path. I have cisco nexus switches and following is my first router ...
2
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1answer
939 views

Cisco nexus vpc spanning-tree port type trunk question

I have very strange scenario here which you can see in diagram. SW1/2 is Cisco nexus 3064PQ switch configured in vPC and those switch connected to SW3/4 ( HP 6120XG ) switches on HP c7000 blade ...
2
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1answer
361 views

Cisco nexus 9396PX TX output discard on 40G interface without link congestion

We have cisco nexus 9396PX with N9K-M12PQ module (12x40G Interface), We have 8x10G L3 LACP bonded connectivity with our ISP and so far so good no issue at all. but recently we migrated that LACP LAg ...
5
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0answers
200 views

Cisco nexus 9396 rebooted with reason xbar_client

Today my one of cisco nexus 9396PX switch got rebooted and this is what i found, based on following logs what could be wrong? We don't have Cisco support for this switch, trying to see if i can get ...
4
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1answer
751 views

Finding the root cause of Spanning-Tree recalculations (on Cisco Nexus 9000s)

I have a nagging Rapid PVST problem on some Nexus 9000 switches. Rapid-PVST keeps recalculating 3 to 5 times an hour. We have in this topology (summarized): Edge Router ...
2
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0answers
258 views

Cisco nexus spanning-tree logging to syslog

I am trying to send my spanning-tree events to remote syslog but somehow it doesn't work, This is what i have in my config. N3K# sh run | grep logg logging level spanning-tree 7 logging server 172.29....
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1answer
553 views

Does vPC peer-gateway cause unicast flooding

This is my network topology where I have SW-1 is configured for HSRP for multiple VLANs, SW-2 & SW-3 connected to SW-1 using vPC. Last few month I am dealing with this unicast flooding where ...
1
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1answer
157 views

Configure Nexus N9K-C93180YC-EX [closed]

I am configuring a switch for the 1st time (Cisco Nexus N9000 Switch) to do some server performance testing in my lab. I have the serial console working and can log into the switch and run commands. ...
4
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1answer
264 views

Strange flooding during installing new switch in network

This is very strange issue i am noticing. In our datacenter we have every switch in rack has cisco vPC configured in short whole datacenter running vPC so there is no loop for spanning-tree anywhere ...
3
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2answers
101 views

Stop Memcrashed amplification DDoS attack

DDoS is essential part of my life so i am back with more question, Yes we started getting memcache based UDP amplification attacks, all source ports are 11211 coming from many random source IPs, we ...
1
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1answer
116 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 ...
3
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0answers
293 views

TCAM utilization on Nexus 9396 switches

I have Cisco Nexus 9396 switch which is running L3 mode and i have configured bunch of IPv4 access-list in Ingress for firewalling to block certain traffic. I am reading about TCAM and wanted to ...
1
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1answer
248 views

SFP compatibility on QLogic FC HBA and Cisco FC SFPs

I do have a server featuring a dual port QLogic FC HBA supporting 2/4/8G interface speed. On the other end there is a Cisco Nexus 5020 with N5K-M1008 module supporting 1/2/4G interface speeds. This is ...
2
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1answer
782 views

Cisco QoS trust and cos-dscp dscp-cos Mapping behaviors

Regarding our current Cisco QoS implementation, to get a deeper understanding I would have some questions I read this: https://www.cisco.com/c/en/us/support/docs/wireless-mobility/voice-over-wireless-...
3
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2answers
260 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 ...
1
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1answer
579 views

Nexus 7K Xbar replacement

Does anyone know if the Xbar module (N7K-C7009-FAB-2) can cause any impact? The replacement will take action during the maintenance window, but better safe than sorry. Thanks in advance for answers