Cisco VSS, Domain ID and Virtual MAC Addresses

The other weekend I connected a L2 circuit between two sites. At both ends were Cisco 6500 Catalyst switches running VSS. The interfaces they connected to were configured as L3 and EIGRP was run between the two sites to share routes. But as soon as they were connected the neighbors started flapping. Troubleshooting started and as always you start at the lowest OSI layer and work up. Bingo! The issue

Automating Cisco Switch Swap Outs

So you can’t automate the entire process unfortunately. You’re still going to need to pull a late night and get your hands dirty… Recently I was tasked with swapping out 4 old Cisco 10/100Mb switches with new 10/100/1000Mb switches. The old switches were a combination of Cisco 3560, 2950 and 3548 series.┬áThe old switches also had some old configurations that needed to be updated and the interface configurations weren’t consistent.┬áThe