Serial Tunneling (STUN) is the tunneling of SDLC frames across a WAN. In the traditional systems network architecture (SNA) world, remote controllers are attached to the front-end processor (FEP) through a set of modems attached over POTS (Plain Old Telephone Service) or leased lines. Difference Between Review And Inspection In Software Testing there. For more information on document conventions, see the.

STUN SDLC is most commonly used in two environments: FEP to remote controller, and AS/400 to remote controller. STUN troubleshooting using Cisco IOS® Software commands as well as AS/400 to remote controller specific issues. As networks move towards integration and remote offices require different type of services (such as NetBIOS, IP, IPX), it made sense from a maintenance and cost point of view to integrate all of these into a single device.

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For example, in the following diagram we see integration of 3270 terminals to the host with NetBIOS traffic of Windows stations. STUN permits you to use IP as a transport for Synchronous Data Link Control (SDLC) frames across a WAN or other media network. This eliminates the need to have an additional leased line or POTS. One SDLC feature of Cisco routers is media translation. In media translation, the router translates the session from SDLC to Logical Link Control, type 2 (LLC2).

This is discussed in detail in. There are two types of STUN configurations: STUN Basic and STUN SDLC. The former is used for any High-Level Data Link Control (HDLC) derivative type frames and the latter is used for SDLC only frames. STUN Basic can also be used for SDLC, but features such as local-ack cannot be used. It's common to use STUN Basic for SDLC for troubleshooting purposes since SDLC-specific parameters do not need to be configured on the router. The first command for any STUN configuration (Basic or SDLC) is stun peer-name. Without stun peer-name, the router won't let you continue with the configuration steps.

Task Command Enable STUN for a particular IP address. Stun peer-name ip-address You must select a valid IP address from the router. This IP address should be the most reliable interface in the box.

For the best results, configure the router with a loopback interface. (To learn about configuring loopback interfaces, refer to the ). The next step is to determine the STUN mode you want to use. One mode is STUN Basic, in which it looks for starting and delimiter of the frame [7e], and transports the frame to the other side. In this mode of operation, STUN doesn't care about the specific state of the session or detailed SDLC information, like the polling address. The other mode is STUN SDLC. This mode requires more detailed decisions in the router, especially if you're running local acknowledgement or any type of multipoint.

The commands used to specify a STUN mode are described in the table below: Task Command Specify a basic protocol group and assign a group number. Stun protocol-group group-number basic Specify an SDLC protocol group and assign a group number.

Stun protocol-group group-number sdlc The next step is to configure the serial interface for STUN. The group that you select in the interface must match the one defined in the protocol-group.

With virtual multipoints, you should also create a stun protocol-group with different numbers for each of the virtual multipoints. Always make sure that you have configured only one secondary interface per stun-group, unless you are configuring sdlc-tg. Task Command Enable STUN function on a serial interface. Encapsulation stun Place the interface in a previously defined STUN group.

Stun group group-number Note: Don't configure this on a Cisco 7000, Cisco 7500, or any other router that has a CxBUS, CyBUS during production network time. O Re Manwa Re Bengali Song Download. This configuration causes the router to change the MTU of the interface to 2032 bytes, which results in a CBUS buffer carve and makes all interfaces of the router bounce (reset). In a Token Ring environment, it can mean that the Token Rings will go down for up to 16 seconds. In addition, since the Cisco 7000 is often the center of the core where this type of problem affects many users. The next step in configuring STUN is to add the stun route statement. You can define this as stun route all or stun route [address]. The configuration options are explained below.

Task Command Forward all TCP traffic for this IP address. Stun route all tcp ip-address Specify TCP encapsulation. Stun route address address-number tcp ip-address [priority] [tcp-queue-max] The above commands are for TCP encapsulation peers.