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Documentation update (multipath).

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This commit is contained in:
Ondrej Zajicek 2010-12-07 23:36:48 +01:00
parent 32b4972834
commit e91f6960ba
1 changed files with 37 additions and 14 deletions
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doc/bird.sgml
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@ -1525,6 +1525,7 @@ on nonbroadcast networks.
protocol ospf <name> {
rfc1583compat <switch>;
tick <num>;
ecmp <switch> [limit <num>];
area <id> {
stub cost <num>;
networks {
@ -1550,6 +1551,8 @@ protocol ospf <name> {
rx buffer [normal|large|<num>];
type [broadcast|nonbroadcast|pointopoint];
strict nonbroadcast <switch>;
check link <switch>;
ecmp weight <num>;
authentication [none|simple|cryptographic];
password "<text>";
password "<text>" {
@ -1584,10 +1587,24 @@ protocol ospf <name> {
url="ftp://ftp.rfc-editor.org/in-notes/rfc1583.txt">. Default
value is no.
<tag>tick <M>num</M></tag>
The routing table calculation and clean-up of areas' databases
is not performed when a single link state
change arrives. To lower the CPU utilization, it's processed later
at periodical intervals of <m/num/ seconds. The default value is 1.
<tag>ecmp <M>switch</M> [limit <M>number</M>]</tag>
This option specifies whether OSPF is allowed to generate
ECMP (equal-cost multipath) routes. Such routes are used when
there are several directions to the destination, each with
the same (computed) cost. This option also allows to specify
a limit on maximal number of nexthops in one route. By
default, ECMP is disabled. If enabled, default value of the
limit is 16.
<tag>area <M>id</M></tag>
This defines an OSPF area with given area ID (an integer or an IPv4
address, similarly to a router ID).
The most important area is
address, similarly to a router ID). The most important area is
the backbone (ID 0) to which every other area must be connected.
<tag>stub cost <M>num</M></tag>
@ -1595,12 +1612,6 @@ protocol ospf &lt;name&gt; {
Setting this value marks area stub with defined cost of default route.
Default value is no. (Area is not stub.)
<tag>tick <M>num</M></tag>
The routing table calculation and clean-up of areas' databases
is not performed when a single link state
change arrives. To lower the CPU utilization, it's processed later
at periodical intervals of <m/num/ seconds. The default value is 1.
<tag>networks { <m/set/ }</tag>
Definition of area IP ranges. This is used in summary LSA origination.
Hidden networks are not propagated into other areas.
@ -1693,15 +1704,20 @@ protocol ospf &lt;name&gt; {
<tag>strict nonbroadcast <M>switch</M></tag>
If set, don't send hello to any undefined neighbor. This switch
is ignored on any non-NBMA network. Default is No.
is ignored on any non-NBMA network. Default value is no.
<tag>check link <M>switch</M></tag>
if set, a hardware link state (reported by OS) is taken into
If set, a hardware link state (reported by OS) is taken into
consideration. When a link disappears (e.g. an ethernet cable is
unplugged), neighbors are immediately considered unreachable
and only the address of the iface (instead of whole network
prefix) is propagated. It is possible that some hardware
drivers or platforms do not implement this feature. Default: off.
drivers or platforms do not implement this feature. Default value is no.
<tag>ecmp weight <M>num</M></tag>
When ECMP (multipath) routes are allowed, this value specifies
a relative weight used for nexthops going through the iface.
Allowed values are 1-256. Default value is 1.
<tag>authentication none</tag>
No passwords are sent in OSPF packets. This is the default value.
@ -2059,6 +2075,9 @@ definition of the protocol contains mainly a list of static routes:
<descrip>
<tag>route <m/prefix/ via <m/ip/</tag> Static route through
a neighboring router.
<tag>route <m/prefix/ multipath via <m/ip/ [weight <m/num/] [via ...]</tag>
Static multipath route. Contains several nexthops (gateways), possibly
with their weights.
<tag>route <m/prefix/ via <m/"interface"/</tag> Static device
route through an interface to hosts on a directly connected network.
<tag>route <m/prefix/ drop|reject|prohibit</tag> Special routes
@ -2082,6 +2101,10 @@ definition of the protocol contains mainly a list of static routes:
protocol static {
table testable; # Connect to a non-default routing table
route 0.0.0.0/0 via 62.168.0.13; # Default route
route 10.0.0.0/8 multipath # Multipath route
via 62.168.0.14 weight 2
via 62.168.1.10
via 62.168.1.11;
route 62.168.0.0/25 reject; # Sink route
route 10.2.0.0/24 via "arc0"; # Secondary network
}