Actually both RIB and FIB (or "routing table" and "CEF table") on a
Cisco router would fit the description from RFC 1812 quoted below.
Ivan
On 27.02.2013 11:21 , Ladislav Lhotka wrote:
On Feb 27, 2013, at 10:50 AM, "Schwarz, Albrecht (Albrecht)"
<[email protected]> wrote:
Any (new) developed terminology by I2RS docs should refer to existing IETF RFCs.
E.g.,
FIB
=> initial term definition = RFC 1812, Appendix B, Glossary:
Forwarding Information Base (FIB)
The table containing the information necessary to forward IP
Datagrams, in this document, is called the Forwarding
Information Base. At minimum, this contains the interface
identifier and next hop information for each reachable
destination network prefix.
Right, but note that this is called RIB in Cisco docs:
http://blog.ioshints.info/2010/09/ribs-and-fibs.html
This definition also doesn't really answer the question whether FIB contains
only active routes - I assume it does.
The BGP spec (RFC 4271) seems to imply the following definitions:
- RIB: data structures internal to each routing protocol instance;
- routing table: bag of routes obtained from different sources, possibly with
multiple routes for the same prefix;
- forwarding table = FIB: a cleaned-up table containing only selected active
routes.
Lada
BTW: RFC 1812 is still the "default (IPv4) router model".
=> initial FIB data model = RFC 2096 (-> RFC 4292)
There are two options for I2RS:
- already existing definition, Y/N?
- existing definition sufficient, Y/N?
IF {Y,Y} THEN just refer
IF {N,-} THEN develop term definition
IF {Y,N} THEN develop derived definition (and refer to base term)
Albrecht
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Ladislav Lhotka
Sent: Mittwoch, 27. Februar 2013 10:32
To: Russ White; Rob (William) Rice
Cc: [email protected]
Subject: Re: [i2rs] Router Models
Russ White <[email protected]> writes:
2. Does the RIB in your diagram include all routes from all sources
or just best routes (those to be used for forwarding)?
All the routes from all sources. The RIB would select which routes to
present to the FIB based on it's internal policy (such as admin
distance). Perhaps the "policy cloud" should really be below the RIB,
between the RIB and the FIB.
It might be useful to have an upfront agreement on the definitions of terms
like RIB, FIB, routing table and forwarding table. Previously, we had an
interesting discussion about them in the NETMOD mailing list, see this thread:
http://www.ietf.org/mail-archive/web/netmod/current/msg06920.html
It turned ot that each of the two major router vendors uses these terms in a
somewhat different sense, and neither of them is identical with how they are
used in IETF documents.
Lada
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Ladislav Lhotka, CZ.NIC Labs
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Ladislav Lhotka, CZ.NIC Labs
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