My 2 cents about ACI l2out – its basics, caveats and considerations
When configuring my first L2out I found very minimum documentation explaining the technical side of configuring L2out, its caveats and limitations. Thus the reason for...
VXLAN SVI suspended as soon as VLAN becomes part of vn-segment
When configuring VXLAN with MP-BGP EVPN Control Plane I’ve come across interesting behavior. When assigning VLAN to VXLAN segment (vn-segment) my SVI for that VLAN...
Cisco OTV not AED Capable – Site VLAN Down – VLAN State Inactive
Setting up basic OTV is fairly simple from the configuration point of view (4 lines of code). But if we forget the workflow we may...
UCS vSAN FC Port-Channel – Isolation due to channel mis-configuration on local or remote switch
If you are getting similar error such as this: “2018 Oct 15 17:20:05 N5K1 %PORT-5-IF_DOWN_BUNDLE_MISCFG: %$VSAN 101%$ Interface fc1/44 is down (Isolation due to channel...
UCS Disjoint Layer-2 Networks – Just another tag
Disjoint Layer 2 Network feature has been around since 2.0 UCSM. That being said this is not something new that you’ll find in this post...
FCoE VFC VSAN stuck at waiting for flogi / initializing – %PORT-5-IF_TRUNK_DOWN: %$VSAN 102%$ Interface vfc102, vsan 102 is down (waiting for flogi)
The most common issue that I see when trying to register vsan to flogi is the issue with association under vsan database. Its very easy...
Nexus Fabric Extender – ERROR: fcoe_mgr: Cannot bind the VFC as the Fex not fcoe configured (err_id 0x4207005B)
If you received this error when trying to associate VFC (Virtual Fiber Channel) there are two simple reasons: Your N2K FEX doesn’t support VFC –...
Verifying limit-resource memory per VDC instance on N7K
Recently, I came across the situation where one of my DCI links started to flap after introduction of EIGRP. At the end it was the...
Discrepancy between interface labels on GNS3 client and NX-OS appliance physical connection
Recently, I had to spin up NX-OS topology for the project I’m working on but I’ve been failing miserable. Nothing wants to work, simple L2...
sh port-channel traffic showing 100% utilization
I have recently come across the situation where I needed to verify port utilization on some uplinks. Since the uplinks utilize port-channel aggregation (EtherChannel/LACP) I...