we want to implement a resiliency project in our network and we think that 7613 will be the ideal choice. it will be equiped with two SUP720-3BXL, two OSM-2+4GE-WAN+ and some optical line cards.
the devices will be positioned as a PE in our MPLS network replacing the existing 7206s.
we have two uplink ports and the first idea was to put them on the OSM modules.
but we find out very soon that the transportation network equipment doesn't support yet optical ports. we buy only optical line cards, so the only uplink option remains the supervisors. but someone attentioned to us that we could loose some of the existing functionality wich is now implemented.
we find out that it is possible to have a physical loop between the supervisor optical SFP port and the optical port from the OSM and do all the job on the OSM . did someone heard about this ?
what is the impact of a such implementation ?
we are a major ISP and we don't want to implement some nasty things in our network .
what I do not understand right now is, what functionality regarding a MPLS PE you´d like to gain - or not loose - with the OSM modules?
The 7613 with the Sup720-3bxl will be well suited to operate as PE router even without OSM.
Besides that you could interconnect them. The main impact is - besides cost! - a more complicated setup than using the Sup720 alone with less performance. The uplinks are a bottleneck compared to the backplane capacity of the Sup720.
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