The FR switch doesn't swap the DLCI automatically, the Service Provider is responsible for the end-to-end PVC, by simply cross-connecting the PVC end-to-end (from the source DLCI to the destination DLCI) by manual configuration on the FR switches.
The Frame Relay switch knows which source the frame came from because it knows the interface on which it was received and it sees the incoming DLCI in the frame. Knowing the inbound interface and DLCI value is sufficient to accurately identify the source. The Frame Relay switch then uses its configuration logic (managed by the Frame Relay service provider) to determine the outboud interface and DLCI value for the frame. The switch then swaps the inbound DLCI with the outbound DLCI.
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.