Category: Work Notes
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multicast study note
PIM-SSM: no RP RP, FHR(closest to the source), LHR(closest to the receiver), Shared tree to SPT(shorted path tree) fallback Bi-DR (phantom RP): no source tree (S,G), only shared tree; DF-closest to RP RPF check — prevent duplicate of multicast packets. When a router receives duplicate streams from different incoming intfs, it performs the RPF-check against…
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VXLAN Terminology
General: ======== Underlay: Overlay: VNI/VNID: L2VNI: L3VNI: IP forward: Infra-vlan: Arp-suppression: NVE: BUM Traffic: Advertise PIP/Virtual RMAC: Node Types: ================ Spine: VTEP(leaf): Border Leaf: Border Gateway: Border Spine: Psuedo Border Gateway (need to validate): NDFC switch roles: Switch Role Description Spine Spine switches provide Layer-3 underlay inter-connection between leaf switches as well as BGP EVPN control…
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An interesting alternative way of subinterface
I was originally searching for a method to change the mac address for the subinterfaces on CSR1000v, and ran into this post. Apparently although the default behavior of subinterface inheriting the physical interface’s mac address can not be changed, with this method the goal can be achieved. The method uses “service instance # ethernet”, along…
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Cisco EEM on NXOS
cli match to trigger a syslog msg: (tested on N9K 9.3(10)) event manager applet 1event cli match “show clock” <—-must enter full command instead of shortened onesaction 1.0 syslog priority critical msg SHOW CLOCK FIRED Then for this to be triggered, you need to allow eem command to run by bypassing terminal: terminal event-manager bypass…
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Cisco Nexus switch maintenance mode
It’s called Graceful Insertion and Removal (GIR), to put the switch in maintenance mode to isolate the switch from traffic path. So it can be troubleshooted or upgrade without affecting production traffic
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CBC SWIM failure on C2960X stack switch
According to SR 693554630, 1. Image distribution for stack 2960 does not work with both HTTPS and SCP 2. Both tar and bin file format does not work. As discussed, It is a known issue with no workaround at this moment. Please perform the upgrade manually. According to 694151108 Action plan: – We need…