mirror of
https://git.proxmox.com/git/mirror_frr
synced 2025-11-04 04:50:35 +00:00
438f5286d4
Modify the documentation so that it talks about FRR instead of Quagga. Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
48 lines
1.8 KiB
Plaintext
48 lines
1.8 KiB
Plaintext
@node Kernel Interface
|
|
@chapter Kernel Interface
|
|
|
|
There are several different methods for reading kernel routing table
|
|
information, updating kernel routing tables, and for looking up
|
|
interfaces.
|
|
|
|
@table @samp
|
|
|
|
@item ioctl
|
|
The @samp{ioctl} method is a very traditional way for reading or writing
|
|
kernel information. @samp{ioctl} can be used for looking up interfaces
|
|
and for modifying interface addresses, flags, mtu settings and other
|
|
types of information. Also, @samp{ioctl} can insert and delete kernel
|
|
routing table entries. It will soon be available on almost any platform
|
|
which zebra supports, but it is a little bit ugly thus far, so if a
|
|
better method is supported by the kernel, zebra will use that.
|
|
|
|
@item sysctl
|
|
@samp{sysctl} can lookup kernel information using MIB (Management
|
|
Information Base) syntax. Normally, it only provides a way of getting
|
|
information from the kernel. So one would usually want to change kernel
|
|
information using another method such as @samp{ioctl}.
|
|
|
|
@item proc filesystem
|
|
@samp{proc filesystem} provides an easy way of getting kernel
|
|
information.
|
|
|
|
@item routing socket
|
|
|
|
@item netlink
|
|
On recent Linux kernels (2.0.x and 2.2.x), there is a kernel/user
|
|
communication support called @code{netlink}. It makes asynchronous
|
|
communication between kernel and Frr possible, similar to a routing
|
|
socket on BSD systems.
|
|
|
|
Before you use this feature, be sure to select (in kernel configuration)
|
|
the kernel/netlink support option 'Kernel/User network link driver' and
|
|
'Routing messages'.
|
|
|
|
Today, the /dev/route special device file is obsolete. Netlink
|
|
communication is done by reading/writing over netlink socket.
|
|
|
|
After the kernel configuration, please reconfigure and rebuild Frr.
|
|
You can use netlink as a dynamic routing update channel between Frr
|
|
and the kernel.
|
|
@end table
|