Cisco has had Fabric Extenders in their Nexus datacenter switch portfolio since 2009. Since there are various models and they all are still appearing in the datacenters here is a summary of all the different FEX models. Updated on 12-Oct-2014: Added Nexus 2348TQ. Updated on 22-Apr-2015: Added Nexus 2332TQ. Nexus 2148T Nexus 2148T was the […]
Tag: cisco
Cat6500/6800 IOS 15SY Feature and Packaging Information
Have you ever wanted to find out what are the differences in Cisco Catalyst 6500/6800 IOS packages (or feature sets)? This is apparently the best source I’ve ever found: Cisco IOS Software Major Release 15SY on Cisco Catalyst 6500 Series Switches (cisco.com) It has a clear table of all the packages (IP Base, IP Services, […]
Configuring BGP Sessions in IPv6
My colleagues were faced with an IPv6 implementation case where the router IOS feature set prevented them from configuring the BGP sessions. I labbed something for them and thought this overall IPv6 BGP session configuration would be worth of documenting here because there are some differences when compared to the usual IPv4-only BGP configurations. I […]
Cisco Nexus 7000 Features Available on Modules
In the Cisco Nexus 7000 series switches there are several features that are bound to the hardware, meaning that your module selection restricts the features you can run on the switch ports. Thus, here is once again a summarization of the module-dependent features: Update 20-Apr-2013: Added OTV and LISP, clarified M1 FEX support. Update 22-Jul-2013: […]
Cat6500 FEX, or Smart Install?
I was surprised when I got a broschure in Cisco Live London 2013 that said Catalyst 6500 is supposed to support FEXes (Fabric Extenders) in the future. Does it make sense? A FEX is a device that looks like a data center LAN switch but it is not designated as a switch. FEX needs a […]
Catalyst 6500 IOS 15.1SY and 12.2SX
Feel free to bash on Catalyst 6500 based on this post as well, I know there are plenty of you who like to complain about this old work horse 😀 On the other hand, there are also plenty of us who run existing installations and designs and still see Cat6500 routing in the network very […]
Configuring vPC to Suspend Orphan Ports
As you should know (simplified rule): Whenever the vPC peer link goes down the vPC secondary switch brings down all its connected vPC ports, assuming those vPCs are up in the vPC primary switch. This means that if you have non-vPC-connected hosts on your vPC secondary switch then those ports are left up and traffic […]
MST and Private VLAN Synchronize
A small example about the “private-vlan synchronize” command in MST configuration mode (vlan 100 = primary VLAN, vlan 101 = secondary (isolated) VLAN): n5k-1(config-mst)# show Pending MST Configuration Name [test] Revision 0 Instances configured 3 Instance Vlans mapped ——– ——————————————————————— 0 1000-4094 1 1-100 2 101-999 ——————————————————————————- These secondary vlans are not mapped to the […]
Private VLANs on Nexus 5000 Series
So it was a usual day in the wonderful world of networking and projects. Then I was suddenly lost in the Private VLANs. You know, the feature that has existed a long time in Cisco switches but still there are some known and unknown limitations in using it. Let’s talk about PVLANs. First the basics […]