Hello,
Some answers:
A. bandwidth reservation is per outgoing interface that RSVP LSP takes
and it is not truly global meaning that of course ingress LSR knows all
the link bandwiths in given IGP domain but if there is "no bandwidth"
signaled by upstream nodes, then ingress LSR router takes it at face
value and Your LSP setup will fail. In fact, there could be BW attained
by "repacking of existing LSPs to outgoing interfaces" in a different
way but JUNOS does not do repacking. To achieve a truly global view of
available and reserved BW, You need a centralised controller called
Northstar but I digress.
B. To map different VRFs to different LSPs You'd need forwarding-table
policy with "install-lsp" knob
http://www.gossamer-threads.com/lists/nsp/juniper/21830
Only equal-cost LSPs are considered in this policy. If Your two parallel
LSP have different cost (by default they shouldn't as the default LSP
cost is the minimum IGP cost to destination loopback) then You'd need to
play with "no-install-to" and "install" knobs coupled with VRF nexthop
rewriting to map different VRFs to different LSPs
https://www.juniper.net/documentation/en_US/junos13.3/topics/usage-guidelines/mpls-configuring-the-ingress-and-egress-router-addresses-for-lsps.html#id-95801
Thanks
Alex
On 26/10/2016 01:34, Scott Granados wrote:
Hi, this is a very basic question at least I think it is, apologies for being
so green in advance.
I’m trying to wrap my head around MPLS and have built a small lab. I
understand how provider routers label switch packets and how provider edges use
VRF instances and their distinguishers and targets to address each other. Per
the Juniper examples I have LDP and RSVP enabled on all the transit interfaces
along with MPLS and obviously the correct interface families (MPLS) attached to
the same transit interfaces.
I then per the doc built a label switched path something like.
set protocol MPLS label-switched-path r1-r4 to 10.0.0.4
;destination loopback of R4 which is acting as a PE
I have an equal return to 1 built as well
I also have a bandwidth reservation defined
set protocol MPLS label-switched-path R1-R4 bandwidth 10M
and a reverse reservation as well
As I understand you build these relationships between the loopbacks. My question is how
does this relate to the VPN VRF entries on the provider edges? Is this a global value that
reserves 10 megabits between R1 and R4? What if you want to reserve 10 megabits and 5
megabits between R1-R4-VRF1 <> R4-r1-vrf1 and r1-r4-vrf2 <> r4-r1-vrf2 where
you have two matching sets of VRFs on the same PE pairs. Is this possible or do I have the
function of RSVP confused?
Again sorry for the n00by question I’m just trying to figure out how all the
pieces fit together. If anyone has any reference pointers that might be a
good start that explains this I would be interested as well. The Juniper
documentation is quite good but I can’t figure this out via searching so far.
Any pointers would be most appreciated.
Thank you
Scott
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