Some common applications for the RE SDK are:
- Using your own routing protocol algorithms to add, delete, and look up routes. Multiple nodes can communicate using the new protocol, and they can also communicate with outside servers that use their own protocols.
- Adding your own MIBs for SNMP extensions.
- Implementing your own extensions to the JUNOS system's user interface; for example, you could write new CLI system management commands to interface with functionality outside the JUNOS system.
- Monitoring interface traffic and statistics.
- Performing light packet processing on the Routing Engine through the Kernel Communication (KCOM) API.
For the Services SDK, typical applications might be the following (all applications run in user space):
- Saving application state in opaque blobs, using the Generic Configuration (GENCFG) API and Service Set Resolution Blobs (SSRBs). GENCFG is a JUNOS feature that allows applications to store their data within the kernel space, and subsequently retrieve or change the data.
- Transit applications: Transit applications are interested in raw packet processing, without involvement of the kernel network stack. They modify and act on the packets in some fashion and forward them onward. Examples of transit applications are Stateful Firewall and IPSec. (For a sample transit application, see Sample Transit Application.)
- Monitoring applications: Monitoring applications are interested in raw packet processing as well, but these applications do not forward packets. They typically work on copies of packets and consume them. Examples of monitoring applications are intrusion detection and passive monitoring. (For a sample monitoring application, see The IPTV Monitor Application.)
- Server applications: Server applications are socket based and rely on the kernel to provide the networking stack. Examples of server applications are IKE and L2TP.
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