Re: Recommendataion of Carrier Etherenet Technology

<jshen.cad@xxxxxxxxx> wrote in message
news:1143340350.060916.99170@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
What I want to learn is :

1) how does ethernet technology applied by ISP network?

varies. at work we have a network built up over 10 years, so Ethernet doesnt
dominate as the lower layer.
lots of local Enet (in exchange points, hosting centres)
Enet directly on lambdas across DWDM (GigE and 10G LAN PHY)
10g WAN PHY on some DWDM that cant handle LAN PHY
10G across dark fibre

Most access links are going in as either GigE on lambda, or on SDH using GFP
(since the existing SDH network goes to all the PoPs)

2) A hot-topic introduction of newest Carrier Ethernet technology, e.g.
S-VLAN, Q-in-Q, PVLAN, user-account and access interface binding
technology

this is a mix of standard based and proprietary terms - some of which isnt
so useful for a WAN.

We use Q in Q on central end of Enet access links to MPLS to allow multiVPN
and link aggregation into a PE router port.

Biggest hassle is that the PEs dont have SDH interfaces that talk GFP, so we
have to break out the set of inverse mux'ed VC-x containers back onto
Ethernet before presenting to a PE...

3) scaling analysis & management analysis, e.g. how does ISP manages
its MAN which is made up of a BIG Ethernet network?

ISPs might have MANs, but most in the UK have a bigger footprint than that,
so the underlying assumption here is false - networks are not just "big
Ethernets".

The real problem for many is managing a big IP / MPLS network (or set of
them) - where Ethernet is a big component. So Ethernet management has to fit
into the bigger picture. And dont bother giving me a standalone management
system - Netcool integration is needed for us for event management and root
cause isolation.........

4) how does DSLAM do with DSL subscriber line using VLAN (or ethernet
) trunking technology?

N/A - dominant carrier here uses ATM on DSL... and what makes you think
VLANs need to traverse a subscriber DSL line at all?

VLANs are only useful if you want to split up the traffic and provide
logical separation. Maybe there is a use for multiple logical pipes on DSL
for business access, i.e. to share the line between a corp WAN and
Internet - but even there DSL probably isnt fast enough for anythin more
than a small office.

regards

Joe

regards

Joe

--
Regards

stephen_hope@xxxxxxxxxxxx - replace xyz with ntl


.

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