Downgrade Software on Router That Runs Cisco IOS-XE SD-WAN to Classic Cisco IOS-XE Software

Problem The user cannot configure boot system flash bootflash: image settings in order to boot the original Cisco IOS-XE image: router#config-transaction admin connected from using console on routerrouter(config)# boot ? ^ % Invalid input detected at ‘^’ marker. router(config)# boot system flash bootflash:c1100-universalk9_ias.16.06.05.SPA.bin ——————-^ syntax error: unknown command Solution The procedure is similar to a software… Read More »

Arista MLAG 101

Article from Configure Port-Channel between the switches. Usually you would want to configure at least 2 links in the Port-Channels but 4 or 8 might be required if you have considerable amounts of data between the switches or for redundancy. Port-channel between the switches On both MLAG-1 and MLAG-2 switches Configure VLAN used by MLAG and… Read More »

Cisco FEX short notes

Fabric Extender Terminology Fabric interface – A 10-Gigabit/40-Gigabit Ethernet uplink port that is designated for connection from the Fabric Extender to its parent switch. A fabric interface cannot be used for any other purpose. It must be directly connected to the parent switch. This interface is enabled when you enter the switchport mode fex-fabric command. Host interface… Read More »


Found an interesting article related to VXLAN and Linux so I made a mirror for my own future reference and reading. The original post is located here: VXLAN is an overlay network to carry Ethernet traffic over an existing (highly available and scalable) IP network while accommodating a very large number of tenants. It is defined in RFC 7348.… Read More »