protocol.texi

大名鼎鼎的路由器源码。程序分ZEBRA、OSPFRIP等3个包。程序框架采用一个路由协议一个进程的方式

@node  Zebra Protocol, Packet Binary Dump Format, SNMP Support, Top
@comment  node-name,  next,  previous,  up
@appendix Zebra Protocol

Zebra Protocol is a protocol which is used between protocol daemon and
zebra.  Each protocol daemon sends selected routes to zebra daemon.  Then
zebra manages which route is installed into the forwarding table.

Zebra Protocol is a TCP-based protocol.  Below is common header of Zebra
Protocol.

@example
@group
0                   1                   2                   3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|           Length (2)          |   Command (1) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
@end group
@end example

Length is total packet length including this header length.  So minimum
length is three.  Command is Zebra Protocol command.

@example
ZEBRA_INTERFACE_ADD                1
ZEBRA_INTERFACE_DELETE             2
ZEBRA_INTERFACE_ADDRESS_ADD        3
ZEBRA_INTERFACE_ADDRESS_DELETE     4
ZEBRA_INTERFACE_UP                 5
ZEBRA_INTERFACE_DOWN               6
ZEBRA_IPV4_ROUTE_ADD               7
ZEBRA_IPV4_ROUTE_DELETE            8
ZEBRA_IPV6_ROUTE_ADD               9
ZEBRA_IPV6_ROUTE_DELETE           10
ZEBRA_REDISTRIBUTE_ADD            11
ZEBRA_REDISTRIBUTE_DELETE         12
ZEBRA_REDISTRIBUTE_DEFAULT_ADD    13
ZEBRA_REDISTRIBUTE_DEFAULT_DELETE 14
ZEBRA_IPV4_NEXTHOP_LOOKUP         15
ZEBRA_IPV6_NEXTHOP_LOOKUP         16
@end example

@example
@group
0                   1                   2                   3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|             Type              |             Flags             |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
@end group
@end example