Cabletron Systems 9A100 - Manual (Page 49)

SmartSwitch 9A100 User Guide 4-7
Switch Administration IP Routing
Enter show PNNIMetric to view the newly created metric pair:
SmartSwitch # 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
SmartSwitch #
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:
SmartSwitch # 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
SmartSwitch #
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 SmartSwitch 9A100 switch provides limited IP routing. IP routing allows switches that are not connected directly
to Ethernet to communicate with an Ethernet-based network management system (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.