Secondary IP addresses allow you to have multiple IP subnets on the same Layer2 broadcast domain. Subinterfaces can be used with different encapsulations (like a trunk on Fast Ethernet or PVC on a serial link) to achieve separate broadcast domains on the same interface. The reason to use one over the other usually depends on the interaction with other features. For example, will seconday ip addresses be distributed automatically by your routing protocol? will traffic forwarded between subnets on the same interface be fast switch or process switched if they are secondary ip's vs subinterfaces. From the LAN perspective you should consider separate broadcast domains for your subnets. That is, subinterfaces and trunk versus secondary ip's.
The following are links that give configuration information and example scenarios for both cases:
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.