Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010, Руководство по настройке

Страница: 685 / 774

The router retains any overriding profiles assigned to a subrange after you modify
the subrange if the override assignment still falls within the modified subrange. If
the assignment falls outside of the newly modified subrange, the router drops the
overriding profile assignment.
You cannot modify a subrange at the same time you are adding or removing a
subrange. If the new modified values for a subrange partially overlap with another
subrange, the operation fails and the router displays an error message.
Merging VC Subranges
You can merge multiple subranges of any particular VC range to form a single unified
subrange, conserving subrange resources. Merging takes place only when you modify
a subrange so that it completely includes at least one other subrange of the same VC
range. The merged subranges do not need to be adjacent to each other.
If the encompassing subrange has any circuits that are outside the subranges to be
merged, those circuits are added. The encompassing subrange must cover a subrange
completely to incorporate it in the merged subrange. The merge operation fails if
the encompassing subrange completely overlaps some subranges but only partially
overlaps with another subrange. The encompassing subrange does not have to
encompass all subranges of the VC range.
Each subrange that is merged with another frees up a subrange. E Series routers
currently support a maximum of 300 bulk-configured VC ranges per chassis.
Therefore, if a VC range consists of 5 subranges, 295 subranges are still available for
subsequent configuration. If you merge 2 of those subranges, resulting in a new total
of 4 subranges in the VC range, then 296 subranges are available for configuration.
The router retains any overriding profile assignments on the subranges made before
the merger, and applies them to the new merged subrange. You can separate merged
subranges either by removing the merged subrange and then adding new separate
subranges or by modifying the merged subrange to remove some portion of the
subrange and then adding a new subrange.
The following example specifies the original VC subranges.
host1(config-if)# atm bulk-config test vc-range 1 1 101 150 vc-range 2 2 201 250
vc-range 5 5 501 550 vc-range 3 3 301 350
The following command merges two subranges, (1, 1, 101, 150) and
(2, 2, 201, 250), and effectively replaces them with the new subrange (1, 2, 101,
250).
host1(config-if)# atm bulk-config test modify vc-range 1 2 101 250
To separate the merged subranges, you can modify the unified subrange and add
subranges as needed, provided that no dynamic ATM 1483 subinterfaces currently
exist for any circuit within those subranges.
If you merge subranges by using SNMP, the new merged subrange takes the lowest
instance value of the incorporated subranges. For example, if a VC range has three
subranges with instance values of 2, 4, and 5 and the subranges with instance values
of 2 and 5 are merged, the new merged subrange has an instance value of 2.
Configuring ATM 1483 Dynamic Subinterfaces
■ 653
Chapter 18: Configuring Dynamic Interfaces Using Bulk Configuration