---
name: "dgrcla"
section: "1"
platform: "linux"
package: "ion"
version: "3.2.1+dfsg-1.1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/dgrcla"
---

# dgrcla(1)

DGR-based BP convergence layer adapter (input and output) task

## NAME

dgrcla - DGR-based BP convergence layer adapter (input and output) task

## SYNOPSIS

**dgrcla** *local\_hostname*\[:*local\_port\_nbr*\]

## DESCRIPTION

**dgrcla** is a background "daemon" task that spawns two threads, one that handles DGR convergence layer protocol input and a second that handles DGR convergence layer protocol output.

The input thread receives DGR messages via a UDP socket bound to *local\_hostname* and *local\_port\_nbr*, extracts bundles from those messages, and passes them to the bundle protocol agent on the local ION node. (*local\_port\_nbr* defaults to 1113 if not specified.)

The output thread extracts bundles from the queues of bundles ready for transmission via DGR to remote bundle protocol agents, encapsulates them in DGR messages, and sends those messages to the appropriate remote UDP sockets as indicated by the host names and UDP port numbers (destination induct names) associated with the bundles by the routing daemons that enqueued them.

Note that **dgrcla** is a "promiscuous" convergence layer daemon, able to transmit bundles to any DGR destination induct.  Its duct name is the name of the corresponding induct, rather than the induct name of any single DGR destination induct to which it might be dedicated, so scheme configuration directives that cite this outduct must provide destination induct IDs.  For the DGR convergence-layer protocol, destination induct IDs are identical to induct names, i.e., they are of the form *local\_hostname*\[:*local\_port\_nbr*\].

**dgrcla** is spawned automatically by **bpadmin** in response to the 's' (START) command that starts operation of the Bundle Protocol, and it is terminated by **bpadmin** in response to an 'x' (STOP) command.  **dgrcla** can also be spawned and terminated in response to START and STOP commands that pertain specifically to the DGR convergence layer protocol.

## EXIT STATUS

- "0"

  **dgrcla** terminated normally, for reasons noted in the **ion.log** file.  If this termination was not commanded, investigate and solve the problem identified in the log file and use **bpadmin** to restart **dgrcla**.

- "1"

  **dgrcla** terminated abnormally, for reasons noted in the **ion.log** file. Investigate and solve the problem identified in the log file, then use **bpadmin** to restart **dgrcla**.

## FILES

No configuration files are needed.

## ENVIRONMENT

No environment variables apply.

## DIAGNOSTICS

The following diagnostics may be issued to the **ion.log** log file:

- dgrcla can't attach to BP.

  **bpadmin** has not yet initialized Bundle Protocol operations.

- No such dgr induct.

  No DGR induct with duct name matching *local\_hostname* and *local\_port\_nbr* has been added to the BP database.  Use **bpadmin** to stop the DGR convergence-layer protocol, add the induct, and then restart the DGR protocol.

- CLI task is already started for this engine.

  Redundant initiation of **dgrcla**.

- No such dgr induct.

  No DGR outduct with duct name matching *local\_hostname* and *local\_port\_nbr* has been added to the BP database.  Use **bpadmin** to stop the DGR convergence-layer protocol, add the outduct, and then restart the DGR protocol.

- Can't get IP address for host

  Operating system error.  Check errtext, correct problem, and restart DGR.

- dgrcla can't open DGR service access point.

  DGR system error.  Check prior messages in **ion.log** log file, correct problem, and then stop and restart the DGR protocol.

- dgrcla can't create sender thread

  Operating system error.  Check errtext, correct problem, and restart DGR.

- dgrcla can't create receiver thread

  Operating system error.  Check errtext, correct problem, and restart DGR.

## BUGS

Report bugs to \<ion-bugs@korgano.eecs.ohiou.edu\>

## SEE ALSO

[*bpadmin*(1)](/bpadmin/1.md), [*bprc*(5)](/bprc/5.md)