[Xorp-users] [OSPF]: reagrding 1583 compatibility

[Atanu Ghosh]

Hi,

This bool changes the preference rules when choosing among multiple
AS-external-LSAs advertising the same destination. It does not revert
the behaviour of the whole OSPF to RFC1583.

>From RFC2328:
----------------------------------------
	RFC1583Compatibility
	    Controls the preference rules used in Section 16.4 when
	    choosing among multiple AS-external-LSAs advertising the
	    same destination. When set to "enabled", the preference
	    rules remain those specified by RFC 1583 ([Ref9]). When set
	    to "disabled", the preference rules are those stated in
	    Section 16.4.1, which prevent routing loops when AS-
	    external-LSAs for the same destination have been originated
	    from different areas. Set to "enabled" by default.

	    In order to minimize the chance of routing loops, all OSPF
	    routers in an OSPF routing domain should have
	    RFC1583Compatibility set identically. When there are routers
	    present that have not been updated with the functionality
	    specified in Section 16.4.1 of this memo, all routers should
	    have RFC1583Compatibility set to "enabled". Otherwise, all
	    routers should have RFC1583Compatibility set to "disabled",
	    preventing all routing loops.
----------------------------------------

The user manual now explains the behaviour of ths flag.

    Atanu.

>>>>> "karnik" == karnik  <karnik.jain at einfochips.com> writes:

    karnik>    hi I am using xorp as a ospf router i want to know
    karnik> following inforamtion: 1) if i enable 1583 compatibility in
    karnik> xorp then it totally behaves as a 1583 compatible router
    karnik> inplace of 2328 ospf .  2) I want to test following on ospf
    karnik> router:
    -> Senario i have to create on ospf router after enabling 1583
    karnik>    compatibility 1. OSPF is enabled on the routers. Wait for
    karnik> their databases to synchronize.  2. TR1 transmits a
    karnik> router-LSA for itself with sequence number 0x70000001.
    karnik> 3. TR1 transmits a router-LSA for itself with sequence
    karnik> number 0x8FFFFFFE after more than minLSInterval.  4. Observe
    karnik> the packets transmitted on network 0.  then I have to check:
    karnik> if the RUT supports RFC 1583, it should drop the router-LSA
    karnik> with sequence number 0x8FFFFFFE.  So my question is How can
    karnik> i test above thing using current your xorp
    karnik> .....................  Can u please guide me reagrding this
    karnik> problem..  --
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