| All the RouteAbouts offer Multilink PPP, which gives the ability to
dynamically use 0, 1 or 2 B channels depending on load.
OSPF (and IS-IS) offer equal cost path splitting, which is different.
If a destination is reachable via two, three or four different paths,
the packets can be spread between the paths (round-robin style). These
paths might all point over the same interface (eg multiple gateways on
an Ethernet). But they could also point over two serial lines. These
would usually be leased lines, and hence this is a way to aggregate the
bandwidth of two leased lines (currently not available in our Multilink
PPP implemenatation).
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If you want use ISDN as your primary link, then you
should consider using Triggered RIP to reduce the
WAN costs. Using load-based aggregation (MPPP) is
also a better solution since the second link is only
up (costing money) when there is a heavy load - with
OSPF path slitting, all channels would be active
due to routing message exchange.
Regards, Steve.
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