In einer eMail vom 26.05.2008 06:18:40 Westeuropäische Normalzeit schreibt
tony.li@tony.li:
To date, no one has demonstrated a routing architecture that scales without I have to disagree. My concept is based on non-aggegation and I am
continuing to improve it so that it is
non-aggregation based from the ingress to the egress, no matter whether a
hop is intra- or inter-domain.
In einer eMail vom 26.05.2008 04:20:40 Westeuropäische Normalzeit schreibt
rja@extremenetworks.com:
John Scudder (Juniper) had a presentation on BGP and FIB/RIB This presentation mentions the importance of fast forwarding.
With my concept (at its current status) any router, from the ingress router
down to the egress router will be enabled to make exactly one single table
lookup for retrieving the next hop. The index for this table is supposed to be
forwarded, unchanged from the ingress router down to the egress router.
It is just like MPLS, but without the need for a label distribution
protocol and without the need for replacing the label/index at each transit
router. But yes, the ingress router must derive it from the destinations' egress
router's geographical coordinates.
The format for forwarding this index is, IMO, secondary. The options are:
outer header, optional paramter, part of the IPv6-address, MPLS-like shim. But
because NIRA is off mainstream, I have to wait and listen what format is
acceptable because needed/ok-ed by any loc/id-split concept.
And it does scale: 600 nodes, approx. 3x600 strict/loose links incl.
precise length values indicating the number of hops. The table to be maintained
is about 72 K entries.
And: Everyone can imagine that the indexed entry may provide a) the best
next hop, plus b): a list of alternative hops like ECMP-hops and even
more.
Multihoming: A user address needs to be combined with aset of
geo.coordinates of different routers from different ISPs.
Mobility: I haven't thought about it yet and I don't know enough about
Mobile. But I am convinced that it will be helpful here too.
Again: Address aggregation is not needed at all. At first, I thought about
avoiding it, as long as the destination is located at some other
longitude/latitude square degree, but were still needed otherwise and also still
needed within OSPF. But now I know: Address aggregation can be made completely
to a non-topic at all.
Heiner
Heiner
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