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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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44 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
53 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
80 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
31 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 ...
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1answer
70 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
195 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 ...
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0answers
45 views

SNMP timeouts on Nexus 9000 (cache is filled up ?)

I've a problem with Nexus 9000 SNMP stack. We've topology where are 4 SNMP servers (Prometheus model) tries to pull interface data every 30 seconds. Seems like for these type of Nexuses 9000 C9372PX (...
2
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2answers
128 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
282 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
168 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 ...
4
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0answers
75 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
257 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
132 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
273 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
100 views

Configure Nexus N9K-C93180YC-EX

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
184 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
78 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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0answers
65 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
139 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
148 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
358 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
176 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
242 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
0
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2answers
324 views

How to check interface statistics via CLI on Cisco Nexus 9508 Switch?

Suppose for some reasons I don't have access to Cisco APIC GUI and I need to check interface statistics of a physical interface of a spine/leaf switch? Which command should I use? Should I go to some ...
4
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1answer
72 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 ...
4
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2answers
590 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? ...
4
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1answer
384 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
43 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
456 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
663 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. ...
4
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2answers
4k 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 ...
4
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1answer
1k 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
568 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 ...
1
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1answer
71 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 ...
1
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1answer
600 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 ...
3
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2answers
414 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 ...
2
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2answers
2k 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
2k 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 ...
1
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1answer
658 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
709 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
99 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 ...
1
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2answers
353 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
87 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 ...
1
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1answer
187 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 ...
1
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0answers
440 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 ...
1
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2answers
416 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 ...
1
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1answer
297 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 ...
2
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1answer
82 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
493 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 ...
1
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1answer
226 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 ...