52
52
MD5 password authentication
54
54
<A HREF="ftp://ftp.rfc-editor.org/in-notes/rfc2385.txt">ftp://ftp.rfc-editor.org/in-notes/rfc2385.txt</A>),
57
<A HREF="ftp://ftp.rfc-editor.org/in-notes/rfc4360.txt">ftp://ftp.rfc-editor.org/in-notes/rfc4360.txt</A>),
57
60
<A HREF="ftp://ftp.rfc-editor.org/in-notes/rfc4456.txt">ftp://ftp.rfc-editor.org/in-notes/rfc4456.txt</A>),
58
61
multiprotocol extensions
60
63
<A HREF="ftp://ftp.rfc-editor.org/in-notes/rfc4760.txt">ftp://ftp.rfc-editor.org/in-notes/rfc4760.txt</A>),
63
<A HREF="ftp://ftp.rfc-editor.org/in-notes/rfc4893.txt">ftp://ftp.rfc-editor.org/in-notes/rfc4893.txt</A>).
66
<A HREF="ftp://ftp.rfc-editor.org/in-notes/rfc4893.txt">ftp://ftp.rfc-editor.org/in-notes/rfc4893.txt</A>),
67
and 4B AS numbers in extended communities
69
<A HREF="ftp://ftp.rfc-editor.org/in-notes/rfc5668.txt">ftp://ftp.rfc-editor.org/in-notes/rfc5668.txt</A>).
65
71
<P>For IPv6, it uses the standard multiprotocol extensions defined in
131
137
subnets. Such IP address have to be reachable through system
132
138
routing table. For multihop BGP it is recommended to
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139
explicitly configure <CODE>source address</CODE> to have it
134
stable. Optional <CODE>number</CODE> argument can be used to limit TTL
135
(the number of hops).
136
Default: switched off.
140
stable. Optional <CODE>number</CODE> argument can be used to specify
141
the number of hops (used for TTL). Note that the number of
142
networks (edges) in a path is counted, i.e. if two BGP
143
speakers are separated by one router, the number of hops is
144
2. Default: switched off.
138
146
<DT><CODE>source address <I>ip</I></CODE><DD><P>Define local address we
139
147
should use for next hop calculation and as a source address
180
188
as an IGP routing table. Default: the same as the table BGP is
191
<DT><CODE>ttl security <I>switch</I></CODE><DD><P>Use GTSM (RFC 5082 - the
192
generalized TTL security mechanism). GTSM protects against
193
spoofed packets by ignoring received packets with a smaller
194
than expected TTL. To work properly, GTSM have to be enabled
195
on both sides of a BGP session. If both <CODE>ttl security</CODE> and
196
<CODE>multihop</CODE> options are enabled, <CODE>multihop</CODE> option should
197
specify proper hop value to compute expected TTL. Kernel
198
support required: Linux: 2.6.34+ (IPv4), 2.6.35+ (IPv6), BSD:
199
since long ago, IPv4 only. Note that full (ICMP protection,
200
for example) RFC 5082 support is provided by Linux
201
only. Default: disabled.
183
203
<DT><CODE>password <I>string</I></CODE><DD><P>Use this password for MD5 authentication
184
204
of BGP sessions. Default: no authentication. Password has to be set by
185
205
external utility (e.g. setkey(8)) on BSD systems.
373
393
its own routing policy, it also has a complete freedom about which community
374
394
attributes it defines and what will their semantics be.
396
<DT><CODE>eclist <CODE>bgp_ext_community</CODE> [O]</CODE><DD><P>List of extended community
397
values associated with the route. Extended communities have similar usage
398
as plain communities, but they have an extended range (to allow 4B ASNs)
399
and a nontrivial structure with a type field. Individual community values are
400
represented using an <CODE>ec</CODE> data type inside the filters.
376
402
<DT><CODE>quad <CODE>bgp_originator_id</CODE> [I, O]</CODE><DD><P>This attribute is created by the
377
403
route reflector when reflecting the route and contains the router ID of the
378
404
originator of the route in the local AS.
743
782
address, similarly to a router ID). The most important area is
744
783
the backbone (ID 0) to which every other area must be connected.
746
<DT><CODE>stub cost <I>num</I></CODE><DD><P>No external (except default) routes are flooded into stub areas.
747
Setting this value marks area stub with defined cost of default route.
748
Default value is no. (Area is not stub.)
785
<DT><CODE>stub</CODE><DD><P>This option configures the area to be a stub area. External
786
routes are not flooded into stub areas. Also summary LSAs can be
787
limited in stub areas (see option <CODE>summary</CODE>).
788
By default, the area is not a stub area.
790
<DT><CODE>nssa</CODE><DD><P>This option configures the area to be a NSSA (Not-So-Stubby
791
Area). NSSA is a variant of a stub area which allows a
792
limited way of external route propagation. Global external
793
routes are not propagated into a NSSA, but an external route
794
can be imported into NSSA as a (area-wide) NSSA-LSA (and
795
possibly translated and/or aggregated on area boundary).
796
By default, the area is not NSSA.
798
<DT><CODE>summary <I>switch</I></CODE><DD><P>This option controls propagation of summary LSAs into stub or
799
NSSA areas. If enabled, summary LSAs are propagated as usual,
800
otherwise just the default summary route (0.0.0.0/0) is
801
propagated (this is sometimes called totally stubby area). If
802
a stub area has more area boundary routers, propagating
803
summary LSAs could lead to more efficient routing at the cost
804
of larger link state database. Default value is no.
806
<DT><CODE>default nssa <I>switch</I></CODE><DD><P>When <CODE>summary</CODE> option is enabled, default summary route is
807
no longer propagated to the NSSA. In that case, this option
808
allows to originate default route as NSSA-LSA to the NSSA.
811
<DT><CODE>default cost <I>num</I></CODE><DD><P>This option controls the cost of a default route propagated to
812
stub and NSSA areas. Default value is 1000.
814
<DT><CODE>default cost2 <I>num</I></CODE><DD><P>When a default route is originated as NSSA-LSA, its cost
815
can use either type 1 or type 2 metric. This option allows
816
to specify the cost of a default route in type 2 metric.
817
By default, type 1 metric (option <CODE>default cost</CODE>) is used.
819
<DT><CODE>translator <I>switch</I></CODE><DD><P>This option controls translation of NSSA-LSAs into external
820
LSAs. By default, one translator per NSSA is automatically
821
elected from area boundary routers. If enabled, this area
822
boundary router would unconditionally translate all NSSA-LSAs
823
regardless of translator election. Default value is no.
825
<DT><CODE>translator stability <I>num</I></CODE><DD><P>This option controls the translator stability interval (in
826
seconds). When the new translator is elected, the old one
827
keeps translating until the interval is over. Default value
750
830
<DT><CODE>networks { <I>set</I> }</CODE><DD><P>Definition of area IP ranges. This is used in summary LSA origination.
751
831
Hidden networks are not propagated into other areas.
833
<DT><CODE>external { <I>set</I> }</CODE><DD><P>Definition of external area IP ranges for NSSAs. This is used
834
for NSSA-LSA translation. Hidden networks are not translated
835
into external LSAs. Networks can have configured route tag.
753
837
<DT><CODE>stubnet <I>prefix</I> { <I>options</I> }</CODE><DD><P>Stub networks are networks that are not transit networks
754
838
between OSPF routers. They are also propagated through an
755
839
OSPF area as a part of a link state database. By default,