6 votes
Accepted

ACL on Nexus 3064PQ performance

That 3K and 9K platforms don't really have a notion of software switching. If it can't be programmed in the forwarding ASIC then it's not forwarded. There are a couple of minor exceptions but for ...
user avatar
  • 6,018
6 votes
Accepted

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

You don’t say which model of Nexus switch you have (initially), but this is a common problem thanks to Cisco having little forethought with regard to storage space (among many other things). One ...
user avatar
  • 4,436
5 votes
Accepted

Gateway on Nexus 3500 with VPC

For your first question, enable 'peer-gateway' under the VPC domain settings. This allows for directed ping forwarding over the VPC peer-link. With core Nexus VPC peers, it is also recommended to ...
user avatar
5 votes
Accepted

interface showing "Link not connected" on a Nexus 2200 FEX but it is very much connected

I found out the upstream 5k was in a pair so I needed to make the interface config change on both 5ks. Problem solved.
user avatar
  • 754
5 votes
Accepted

Applying a queuing service policy

The default-class uses (by default) 50 percent of the available bandwidth. You can reduce that value as part of your policy-map. For example: policy-map type queuing TA-queuing ... class-type ...
user avatar
  • 62k
5 votes
Accepted

Control plane terminology - Cisco Nexus

While most devices probably have a single physical control plane, others may have two or both layers may be differentiated in software with two logical control planes. I guess there's no single answer....
user avatar
  • 69.5k
5 votes
Accepted

How to announce network to specific neighbor peer in BGP

Here is a generic example: ip prefix-list TO-A seq 10 permit 74.100.100.0/23 le 32 ! ip prefix-list TO-B seq 10 permit 74.20.20.0/23 le 32 ! the 'le 32' allows smaller subnets of that block ! router ...
user avatar
  • 62k
5 votes
Accepted

Cisco nexus 3048 SFP validation failed

Solved: After reboot switch it fixed my issue, Now its showing SFP Type 10Gbase-SR n3k# show int e1/49 capabilities Ethernet1/49 Model: N3K-C3048TP-1GE-SUP Type (SFP capable): ...
user avatar
  • 4,227
5 votes
Accepted

Nexus 3172T MTU

It appears that the Nexus 3172 can only do QoS MTU, not per port MTU. Configure and Verify Maximum Transmission Unit on Cisco Nexus Platforms Layer 2 MTU Configurations Layer 2 MTU is set ...
user avatar
  • 92.9k
5 votes

Cisco NX-OS licensing

In the Cisco Nexus 3048 Switch Data Sheet in table 3 you can see this: (sorry for the image I cannot get the formatting right with a text paste) So without specific license you get basic features ...
user avatar
  • 18.3k
5 votes
Accepted

Strange flooding during installing new switch in network

I think I set the path to this answer in the other thread, it took me some time to follow it through. ... when a non-portfast port (regardless if individual or port-channel) goes "FWD", a ...
user avatar
5 votes

Does vPC peer-gateway cause unicast flooding

I don't think that peer-gateway is needed on SW-3 at all, as it serves somewhat of a corner case (see below), only useful if the the given nexus has SVIs (interface vlan XXX) and acts as default ...
user avatar
5 votes
Accepted

BGP multi-path using loopback

Do I need to add update-source loopback0 in BGPconfig and why? Yes, otherwise the router will use the closest interface, which would be either f0/0 or f0/1. The BGP process is expecting the BGP ...
user avatar
  • 62k
5 votes
Accepted

Cisco Nexus 9300 TCAM carving

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/6-x/security/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_Security_Configuration_Guide/b_Cisco_Nexus_9000_Series_NX-...
user avatar
  • 2,083
5 votes

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

Any ideas? Yes. Looks like your ping syntax is wrong. To verify, exit the TCL shell and trying running the same ping command from your script substituting in an appropriate value: ping vrf XYZ 10.xx....
user avatar
  • 26.7k
5 votes

Difference between N3K and N5K

Be sure to understand the limitations of the N5K https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5500/sw/Verified_Scalability/730N11/b_5500_Verified_Scalability_730N11/...
user avatar
5 votes
Accepted

BGP running on VLAN interface or loopback0?

It is always recommended in BGP best practices to peer with loopback addresses for iBGP peers as we no longer have to rely on a single physical interface (or in your case a VLAN SVI) to be up/up. As ...
user avatar
  • 1,277
5 votes

BGP over VPC on NEXUS

The only circumstances under which you'd have the same address on two different boxes are various flavors of anycast and HSRP/VRRP. This definitely does not include routing protocols. In your ...
user avatar
  • 6,018
4 votes
Accepted

default interface cmd on cisco nexus 5k

It actually depends on the NX-OS version running on the switch (and hence the switch model). Starting with version 6.0(2)N2(1), the default interface command has been added to the nexus world. Compare ...
user avatar
  • 1,039
4 votes
Accepted

UDLD on Nexus 5548 and Nexus 2232

The thing is the Nexus 2000s aren't autonomous switches. They are essentially line cards for the 5ks (or 7ks) and have no independent existence, so you can't run the normal protocols across those fex-...
user avatar
4 votes
Accepted

Network design question for datacenter

The 5600-series can switch 40G at line rate (...as in full 40Gbit/s flows) but won't ever be able to switch full 100G interfaces (nb - fabric is limited to 40G flows). The 5500 can only support 40G ...
user avatar
  • 6,018
4 votes

vPC traffic flow question

It depends on whether you have a vPC between the aggregation and core layers. If the connection between (A1, A2) and (C1, C2) is a vPC, then the switch always prefers "local forwarding". That is, any ...
user avatar
  • 2,396
4 votes
Accepted

nexus ospf network statement missing

Cisco routers (and switches) treat loopback interfaces as host routes by default. You can change this behavior by interface loopback1 ip ospf network point-to-point
user avatar
  • 62k
4 votes

ftp user in cisco nexus 5010 switch

I was able to Goole the answer in less time than it took for you to write the question: Configure the FTP username and password. CE_2#config terminal CE_2(config)#ip ftp username cisco CE_2(config)#...
user avatar
  • 62k
4 votes
Accepted

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

Solved This command was missing in e1/27 interface. spanning-tree port type edge trunk Full interface output look like following. interface Ethernet1/27 description Connected to server switchport ...
user avatar
  • 4,227
4 votes
Accepted

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

I don't think there are any 10G linecards/modules for the CAT6500 that directly support SFP+ modules. WS-X6700 Series: https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6500-series-...
user avatar
4 votes

Nexus 3172T MTU

Usually Nexus have this config section: policy-map type network-qos jumbo class type network-qos class-default mtu 9216 ... system qos service-policy type network-qos jumbo While this ...
user avatar
4 votes
Accepted

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

In my case, I was able to solve the problem by turning on these debugs on Nexus9000_2: debug spanning-tree rstp interface eth1/54 debug spanning-tree event interface eth1/54 debug spanning-tree ...
user avatar

Only top scored, non community-wiki answers of a minimum length are eligible