Beta Draft Confidential
Configuring Trunks
Configuring VNN OSPF
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/057-53
4. Complete the fields as described in Table 7-11.
Table 7-11. Add VNN External route Aggregation Dialog Box Fields
Field Action/Description
Network Enter the IP address of the network or subnetwork that encompasses the
range of addresses you want to advertise.
Net Mask Enter the subnet mask that pertains to the net or subnet.
External
Metric Type
Select one of the following options to calculate the administrative cost for
the external network:
Type 1 - The total cost is equal to the cost specified by the preferred
routing table entry for the ASBR or forwarding address plus the cost
specified in the LSA.
If IC = the cost specified by routing table for ASBR,
and
EC = the cost specified in the LSA,
then the Type 1 cost = IC + EC.
Type 2 - (default) The total cost is equal to the cost specified by the LSA
only, regardless of internal cost to ASBR.
If IC = the cost specified by routing table entry for ASBR,
and
EC = the cost specified in the LSA,
then the Type 2 cost = EC.
Note: Type 1 routes are typically preferred over Type 2 routes. The Type 2
metric assumes that routing between autonomous systems is the major cost
of routing a packet, and eliminates the need for conversion of external
costs to internal metrics.
Advertise
Matching
Select one of the following options:
Enable – (default) Select the check box to enable advertise matching. If
you enable this parameter, you “leak” the net/mask you specified for the
given area, making it available to the rest of the network. Enabling this
option allows the switch to advertise the aggregate routes as well as the
individual routes.
Disable – Select the check box to disable this parameter. If you disable
advertise matching, you hide the net/mask you specified for the given area.
Disabling this option causes only the aggregate routes to be advertised,
while the individual routes will be suppressed.
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