Category: Cisco
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Hidden Internal VLANs on a Cisco 6500
Something interesting about a Cisco 6500 is that it uses hidden internal VLANs. Most people will never be aware of this because the assignment starts in the extended VLAN range. An internal VLAN is created for every port in your chassis that is not an access port. The command to view these VLANs is “show…
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Cisco – Prepending Subset of Your BGP Addressing
Scenario: You have a production site in Dallas and a backup site in, say, College Station(CS). You want the public subnet 1.2.3.0/24 to failover to CS if the Dallas facility falls off of the earth. What you want to do my friend is prepend. Prepending is adding your own Autonomous System Number(AS) repeatedly to the…