Re: [nsp] Cisco vs. Juniper of LSP setup

From: Sean Crocker (crockers@mail.trinicom.com)
Date: Fri Apr 12 2002 - 14:15:04 EDT

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Lu,

>If I understand this right, not only IOS does not have
>the function of ignoring TE datatbase like the
>"no-cspf" in Juniper, it also can not run RSVP without
>enabling OSPF opaque LSA on a interface. I have not

No, I'm just saying it's not as straightforward and "meant for mass
consumption" as juniper's no-cspf. If you use verbatim and an
explicit path with at least one entry (or all the nodes from ingress
to egress if you like) you can get the cisco ingress to signal path
setup via RSVP-TE without having to use IGP-TE.

>tried IS-IS, but I assume it has to have the
>wide-metric enabled in order to run the MPLS-TE,
>right?

Yes, you need wide-metric wide among a few other things configured.

HTH,
Sean

>
>Thanks
>LU
>
>
>
>--- Sean Crocker <crockers@mail.trinicom.com> wrote:
>> There's nothing like Juniper's no-cspf.
>>
>> There is a way that is
>> hidden/undocumented/unsupported. Unless IOS
>> has changed since last I looked, you have to define
>> an explicit path,
>> then append "verbatim" to the path-option
>> statement...
>>
>> R1(config-if)#tunnel mpls traffic-eng path-option 1
>> explicit name foo verbatim
>>
>> The explicit-path can be as short as just one node
>> (the directly-
>> connected next-hop). The next node (either cisco
>> and juniper) will
>> strip out the PATH's ERO and send it on towards
>> egress according to the
>> RIB, so from that point on it's like no-cspf.
>>
>> Sean
>>
>>
>> >I just noticed that in cisco you can not establish
>> LSP
>> >without enabling OSPF
>> >opaque LSA, this is quite different from Juniper.
>> >JUNOS allows you to set up
>> >LSP just based on normal IGP information. Am I
>> missing
>> >some commands in IOS?
>> >Does IOS have a way to enable MPLS-TE without
>> having
>> >OSPF opaque LSA?
>> >
>> >Thanks
>> >LU
>> >
>> >__________________________________________________
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>
>
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