On a current Catalyst product Is it better to assign an IP address directly to a VLAN interface or to assign an IP address to a Loopback interface that is in a particular VLAN? What are the benefits or pitfalls of either method?
Not sure what you mean by a loopback address in a given vlan. Generally you would have a single loopback for a given L3 device and this is used by any dynamic routing protocols like ospf or eigrp as this interface is always in a up/up state .
What I mean by that is creating a loopback interface and placing it in the particular VLAN as opposed to assigning the VLAN interface an IP address directly. So, for example, let's take a Catalyst 6506. If I'm hosting three VLANs 10-12 that need IP addresses (default routes for three different networks) I would potentially have three loopback interfaces with an IP address (one in each subnet consumed by those VLANs). The alternative is to instead assign the VLAN interfaces the IP addresses and not mess with loopback interfaces.
So lets give an example. Normally I just assign addresses to the VLANs thusly:
ip address 10.10.10.1
ip address 10.10.11.1
ip address 10.10.12.1
I'm asking if it's good, bad, or indifferent to use loopback interfaces instead:
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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