Free up Junper SRX disk or storage space

1. Check the amount of disk usage:
show system storage
2. Perform an automated device storage/disk cleanup:
request system storage cleanup

Upgrade a standalone Cisco Catalyst 3750 (not in a Stack)

1. Download and save the required image from the Cisco website.
2. Ensure you have the minumum amount of storage space on your flash drive. For the IP Services image this is likely to be 16Mb.

Apply the command:

dir flash:

3. In this example I use TFTP32 to transfer files from my desktop to the switch.

Apply the command:
copy tftp:.bin flash:

4. Once the new IOS image has been transferred, configure the switch to boot with the new image the next time it reloads:

Apply the following commands:
config terminal
boot system flash:/.bin
exit
write memory
reload

Note: There is no need to change the config-register value as the it is fixed on the Catalyst 3750.

5. Type "yes" or press enter to confirm to reload.

6. Once reloaded check that you are using the new image:
show version

Route Distinguishers and Route Targets

A VRF represents an isolated instance on a device of a routing and forwarding table. A VRF belongs to a site and is assigned to a interface (logical or physical). This interface is used to peer to the CE to exchange routing updates and packets. These updates and packets are identified in the core (provider network) by a ROUTE DISTINGUISHER and thus making it unique where there is a overlap of addressing schemes from different VRFs.

A VPN is a service which provides security and isolation normally found in a private network over a shared provider infrastructure. The scope of a VPN is contained by what routing and forwarding is required by a organizations network. Therefore a VPN can entail multiple VRFs if it requires access to networks in different VRFs. The ROUTE TARGET is used to determine what routing information to import or export from a VRF and thus creating the scope of the VPN.