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Lo,
We use Juniper MX series routers, and take various NNI services from
operators like TalkTalk, BT Wholesale, etc... Essentially each VLAN they
present on the same particular Juniper interface is a different leased
line.
But if a leased line goes down, that subinterface (a Juniper 'unit' with
a vlan-id on it) doesn't go down. So a) we don't get any alerts, and b)
if the customer has a backup leased line, our systems don't know to
automatically swap to that.
After checking with people like BT Wholesale, it would seem they do get
OAM-CFM from Openreach, but then neglect to actually pass that upstream
to us. How common is this likely to be with other suppliers? does
anyone know if there is something stopping BT Wholesale (or others?)
from passing back this information?
We know we could supply our own hardware to the customer. But that
would mean the customer would have the Openreach ADVA NTU, plus their
own router (of their choosing), *and* a third box from us (sitting in
between the other two) acting as another NTU... just for this one
purpose of generating our own OAM-CFM.
Although we deal with Openreach directly for exchanges we've opened up
locally (so locally we don't have this issue)... if we're providing
leased lines further afield (e.g. sold via BT Wholesale, TalkTalk,
etc...) then we can't guarantee a timely replacement of such an extra
NTU (that we've supplied) should it fail, as we don't have engineers
that far out.
One thought was to monitor a thing that the customer was likely to have.
This might be to poll for ICMP or listen for BFD polls from their
router, and then if it stops... to have the Juniper disconnect what that
unit is connected to (e.g. a psuedowire across our MPLS core to where IP
or VPLS services are delivered) but continue to listen on the unit to
see if it comes back. But there doesn't seem to be any elegant
configuration to do this, that we're aware of.
Just wondering if anyone had encountered this scenario before and what
might be best practice?
Thanks
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Steven Maddox
Business Systems Engineer
Internet Central Limited
Registered in England & Wales number 03079542 at Ivy House Foundry,
Stoke-on-Trent, ST1 3NR. VAT registration number GB278923705. Read our
disclaimer at http://ic.uk/legal before acting on this e-mail.
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