But please stop talking about _a lot of interface changes_ etc withouth
referencing to the type of network. In case of leased-links network I can
built the network of ANY size; and limitations depends of the link
stability, not of the network size.
I was talking about ISP network which mostly is leased-line based.
It depends on link stability and router stability. As I pointed out
in my previous message, the more router and link a network has (i.e.
the large scaled network), the large chance of having link flapping
and router crashes (if you think in percentage sense), the more flooding,
SPF calculation and LSDB update all routers in the network have to
handle. If there is a hierarchy, then only a portion of routers (not all
the routers) would need to handle flooding, SPF calculation and LSDB update.
Also, the large the size of network (lots of routers and links), the
bigger the LSDB and the higher complexity of SPF calculation.
--Jessica
I was talking about ISP network which mostly is leased-line based.
It depends on link stability and router stability. As I pointed out
in my previous message, the more router and link a network has (i.e.
the large scaled network), the large chance of having link flapping
and router crashes (if you think in percentage sense), the more flooding,
SPF calculation and LSDB update all routers in the network have to
handle. If there is a hierarchy, then only a portion of routers (not all
the routers) would need to handle flooding, SPF calculation and LSDB update.
You are 100% right - it's the classic.
Through the initial question whas _does we need hierarchical multi-level
SPF routing schema?_. And my opinion was _yes, but due to administration,
but not CPU/memory issues (yes, this is important too but it's
importance is usially overestimated).
And no one from this list argued for this hierarchy at all.
Also, the large the size of network (lots of routers and links), the
bigger the LSDB and the higher complexity of SPF calculation.
--Jessica
Aleksei Roudnev, Network Operations Center, Relcom, Moscow
(+7 095) 194-19-95 (Network Operations Center Hot Line),(+7 095) 230-41-41, N 13729 (pager)
(+7 095) 196-72-12 (Support), (+7 095) 194-33-28 (Fax)