[Xorp-users] Xorp-users Digest, Vol 29, Issue 2
karnik.jain at einfochips.com
karnik.jain at einfochips.com
Sat Aug 9 02:49:21 PDT 2008
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> Today's Topics:
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> 1. [OSPF]: reagrding 1583 compatibility (karnik)
> 2. Re: [OSPF]: reagrding 1583 compatibility (Atanu Ghosh)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Fri, 08 Aug 2008 15:27:26 +0530
> From: karnik <karnik.jain at einfochips.com>
> Subject: [Xorp-users] [OSPF]: reagrding 1583 compatibility
> To: xorp-users at xorp.org
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> Message: 2
> Date: Fri, 08 Aug 2008 08:58:22 -0700
> From: Atanu Ghosh <atanu at icir.org>
> Subject: Re: [Xorp-users] [OSPF]: reagrding 1583 compatibility
> To: karnik <karnik.jain at einfochips.com>
> Cc: xorp-users at xorp.org
> Message-ID: <55026.1218211102 at xorps.icir.org>
>
> 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.. --
> karnik>
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> End of Xorp-users Digest, Vol 29, Issue 2
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With regards,
K at rN|K,
Embedded Dept.
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