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-# Syslog protocol support {#syslog_doc}
-
-VPP provides [RFC5424](https://tools.ietf.org/html/rfc5424) syslog protocol
-logging, which is used to transport event messages across network. VPP
-currently suports UDP transport based on
-[RFC5426](https://tools.ietf.org/html/rfc5426).
-
-The syslog message has the following format:
-* header
-* structured data
-* free-form message
-
-The header contains, priority, version, timestamp, hostname, application,
-process id and message id. It is followed by structured data, which provides
-a mechanism to express event data in easily parsable format. Structured data
-can contain zero, one or multiple structured data elements. Structured data
-element contains name-value pairs. Structured data can by followed by free-form
-message.
-
-Following example explains how to use the internal APIs to genrate syslog
-message:
-```{.c}
- #include <vnet/syslog/syslog.h>
-
- ...
-
- syslog_msg_t syslog_msg;
-
- /* Check if syslog logging is enabled */
- if (!syslog_is_enabled ())
- return;
-
- /* Severity filer test */
- if (syslog_severity_filter_block (severity))
- return;
-
- /* Initialize syslog message header */
- syslog_msg_init (&syslog_msg, facility, severity, "NAT", "SADD");
-
- /* Create structured data element */
- syslog_msg_sd_init (&syslog_msg, "nsess");
- /* Add structured data element parameters (name-value pairs) */
- syslog_msg_add_sd_param (&syslog_msg, "SSUBIX", "%d", ssubix);
- syslog_msg_add_sd_param (&syslog_msg, "SVLAN", "%d", svlan);
- syslog_msg_add_sd_param (&syslog_msg, "IATYP", "IPv4");
- syslog_msg_add_sd_param (&syslog_msg, "ISADDR", "%U",
- format_ip4_address, isaddr);
- syslog_msg_add_sd_param (&syslog_msg, "ISPORT", "%d", isport);
- syslog_msg_add_sd_param (&syslog_msg, "XATYP", "IPv4");
- syslog_msg_add_sd_param (&syslog_msg, "XSADDR", "%U",
- format_ip4_address, xsaddr);
- syslog_msg_add_sd_param (&syslog_msg, "XSPORT", "%d", xsport);
- syslog_msg_add_sd_param (&syslog_msg, "PROTO", "%d", proto);
-
- /* Send syslog message */
- syslog_msg_send (&syslog_msg);
-```
-
-Example above produces following syslog message:
- <134>1 2018-11-12T11:25:30.252715Z 172.16.4.1 NAT 5901 SADD [nsess SSUBIX="0" SVLAN="0" IATYP="IPv4" ISADDR="172.16.1.2" ISPORT="6303" XATYP="IPv4" XSADDR="10.0.0.3" XSPORT="16253" PROTO="6"]
-
-To add free-form message use:
-```{.c}
- syslog_msg_add_msg (&syslog_msg, "event log entry");
-```