Cabletron Systems SmartCell ZX-250, User Manual

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SmartCell ZX-250 User Guide 4-7
Switch Administration IP Routing
Enter
show PNNIMetric
to view the newly created metric pair:
SmartCell ZX # show pnnimetrics
Metrics(ALL) :
Metrics Metrics Tag Direction Index GCAC CLP Admin Wt Service Categories
================================================================================
1 0x9 Incoming 0x10 CLP0+1 200 CBR
2 0x9 Outgoing 0x10 CLP0+1 200 CBR
3 0x111113 Outgoing 0x1 CLP0+1 5040 UBR
4 0x111113 Outgoing 0x2 CLP0+1 5040 ABR
5 0x111113 Outgoing 0x4 CLP0 5040 NRTVBR
6 0x111113 Outgoing 0x18 CLP0 5040 CBR RTVBR
7 0x111114 Outgoing 0x1 CLP0+1 5040 UBR
8 0x111114 Outgoing 0x2 CLP0+1 5040 ABR
9 0x111114 Outgoing 0x4 CLP0 5040 NRTVBR
10 0x111114 Outgoing 0x18 CLP0 5040 CBR RTVBR
SmartCell ZX #
The newly created metric pair appears at the top of the list.
Once the metric is created, we can specify its metric tag number within the definition of a route:
SmartCell ZX # add atmroute
PortNumber(A1) : b2
AtmAddress() : 39:00:00:00:00:00:00:00:00:00:55:77:88
PrefixLength(104) :
Index(0) :
Type(Internal) :
Scope(0) :
MetricsTag(0) : 9 < The index tag of our metric pair
SmartCell ZX #
Administrative Weight and Parallel Routes
A route’s administrative weight defines its desirability to the PNNI routing service with regard to computing a path to
a particular location. The lower the administrative weight, the more desirable the route. For example, a route with
administrative weight 200 is considered a better route than one with the default weight of 5040. As a result, the
administrative weight provides a quantitative way to control which routes are favored for call set up.
The ability to control the PNNI routing service in this fashion allows for parallel routes into an IISP domain to be
weighted such that one route is designated as the default, while the other becomes the backup route. This
default/backup routing topology is typically used where a link to a particular domain requires a high degree of
reliability. If the default route becomes congested or reaches its bandwidth limit, the routing service can initiate load
sharing by routing additional calls through the backup route.
4.3 IP ROUTING
The SmartCell ZX-250 switch provides limited IP routing. IP routing allows switches that are not connected directly
to the Ethernet to communicate with an Ethernet-based NMS. The connection is made by adding IP routes on the
non-connected switches that specify a client on a connected switch as their gateway to the Ethernet.