Lustre 1.6 Operations Manual

The expansion is a list enclosed in square brackets. Numeric items in the list may be
a single number, a contiguous range of numbers, or a strided range of numbers. For
example, routes="elan 192.168.1.[22-24]@tcp" says that network elan0 is adjacent
(hopcount defaults to 1); and is accessible via 3 routers on the tcp0 network
(192.168.1.22@tcp, 192.168.1.23@tcp and 192.168.1.24@tcp).
routes="[tcp,vib] 2 [8-14/2]@elan" says that 2 networks (tcp0 and vib0) are accessible
through 4 routers (8@elan, 10@elan, 12@elan and 14@elan). The hopcount of 2 means
that traffic to both these networks will be traversed 2 routers - first one of the routers
specified in this entry, then one more.
Duplicate entries, entries that route to a local network, and entries that specify
routers on a non-local network are ignored.
Equivalent entries are resolved in favor of the route with the shorter hopcount. The
hopcount, if omitted, defaults to 1 (the remote network is adjacent).
It is an error to specify routes to the same destination with routers on different local
networks.
If the target network string contains no expansions, then the hopcount defaults to 1
and may be omitted (that is, the remote network is adjacent). In practice, this is true
for most multi-network configurations. It is an error to specify an inconsistent hop
count for a given target network. This is why an explicit hopcount is required if the
target network string specifies more than one network.
31-6 Lustre 1.6 Operations Manual • September 2008