40G IP Router
interfaces
Link bandwidth requires N X
10G
Problems with link
aggregation
Most flows small,
distribute nicely
Large flows from MPLS/IPSEC
problematic
32-40 Ch DWDM ring
exhaust
Multi-access DWDM rings in
metro
Typically 5 nodes, some
larger
At exhaust build entire new ring
New fiber, amps, ROADMs,
installation, space, power,É
Or add a pair of 40G transponders