L3SW#1/2 and L3SW#3/4 use HSRP to provide redundancy for the gateway IP (GWIP) destined for the opposite L3SW. Since they are on the same VLAN, this creates a loop configuration. However, because STP is enabled on L3SW#1/2, the port to L3SW#2's L2SW ...

CRC errors are increasing on the ports of the Catalyst 2960 switch. Currently, since there isn't much traffic flowing, the increase has stopped.When checked with `show int`, input errors and CRC errors have increased.When checked with `show int cou e...

After upgrading the Catalyst 9000 OS to 17.12.x, the “speed nonegotiate” setting was added to the channel interface configured with 40G QSFP.I set speed auto, but could not change it with an error.I checked with show int status and speed is fixed to ...

The R1 and R2 routers are running eBGP on the WAN side (left) and iBGP on the LAN side (right). In addition, StaticRoute for LAN is configured and advertised by BGP to the WAN side.The eBGP neighbor of R2 uses Path prepend to prioritize routes via R1...