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have defined the adjacent link station to be a network node on one of the
earlier configuration prompts. Answer no if you want the router to appear as
a network node on this link. A network node is for links to end nodes
b. The
Is uplink to another Branch Extender node
question is asked only if this
link has been defined as a limited resource and has also been defined as a
Branch Extender uplink. Answer yes if the adjacent node is another Branch
Extender.
c. The
Preferred network node server
question is asked only if the adjacent
node is a network node and CP-CP sessions are supported on this link.
Since you can only have a single preferred network node server you won’t
be prompted for this question once it has been set to yes on any link.
Configuring Extended Border Nodes
To configure extended border node you must configure one or more of these
parameters:
v Set node
v Add port
v Add link
v Add routing_list
v Add cos_mapping_table
Set node
The previously existing prompt used to enable branch extender has been expanded
to allow you to choose the branch extender function, the extended border node
function, or neither. Only if you enable the extended border node function will any of
the other extended border node prompts appear.
Subnetwork visit count
is the first prompt. This parameter defines the maximum
number of topology subnetworks a session may span. The value defined here is
used as the default value for the extended border node. You can specify different
values for the
subnetwork visit count
when adding ports, links, or routing lists.
Cache search time
is the next node level prompt. This specifies the number of
minutes the extended border node will retain information on multi-subnetwork
searches. The intention is for this to be the primary mechanism for limiting the size
of this cache. However, the next parameter can also be used to control the size of
this cache.
Maximum search cache size
is next. This controls the same data structure
controlled by the previous parameter. If set to zero, the maximum size is unlimited.
Entries will be discarded only after the search cache time has expired. If you prefer
to have a fixed maximum size for the search cache then specify that here. If this
maximum is reached before any entries exceed the time limit the least recently
entries are discarded.
List dynamics
is the next prompt, and it allows you to control how the extended
border node determines possible next hops when attempting to locate resources
(LUs). The temporary list of possible next hop CPs is built dynamically by the
operational code whenever the border node is attempting to locate a resource. This
parameter specifies source(s) of next hop CP name(s) the extended border node
may use to build this temporary dynamic list of CP names.
APPN
Chapter 1. APPN 31