Connecting Switches via VPCs Over VOID or Public UNI Interfaces
1. In cases where it is not appropriate for an IISP link to use the default VPI (VPI=0), then the solution to
interconnect switches is to define the port as a VOID port and set up a VP link with VPI=x.
2. VP tunneling over a WAN. Very often when a link crosses a WAN the service provider will not allow
the use of VPI=0 because it is used for internal WAN traffic. Consequently, the private organization
must use another VPI than the default. In addition, at both ends of the WAN, the VPI could be
different, as shown in Figure 5 on page 52.
port 2.2
port 3.3
┌──────────┐
┌───────────┐
┌──────────┐
│ Switch 1 ├────────┤
WAN
├────────┤ Switch 2 │
└──────────┘
└───────────┘
└──────────┘
VPI=1
VPI=4
VPCI=6
VPCI=6
Figure 5. VP Tunneling Over a WAN
If Switch 1 and Switch 2 are part of the same PNNI peer group they will still be able to communicate
thanks to the definition of the same Virtual Path Channel Identifier (VPCI) at both ends, achieved by
entering the following commands:
à
ð
8265ATM
>
set port 2.2 enable public_uni
8265ATM> set vpc_link 2.2 1 enable pnni bandwidth:155ððð vpci:6
8265ATM> set port 3.3 enable public_uni
8265ATM> set vpc_link 3.3 4 enable pnni bandwidth:155ððð vpci:6
8265ATM>
á
ñ
Connecting Switches via a WAN
When connecting two switches via a WAN you must:
Define the two connecting ports as either Public UNI or VOID links.
Define, via the SET VPC_LINK command, a VPC link between the ports, of type:
– PNNI if the switches belong to the same peer group
– IISP if the switches belong to different peer groups
If the VPC link is type IISP, define, via the SET REACHABLE_ADDRESS command, the address that
is to be reached over link (at both ends). At the other switch, enter the reachable address of your
switch.
If the two switches are to belong to the same PNNI peer group, ensure that the peer group id of both
switches match (and are less than 104 bits in length). See “Configuring Peer Group Identifiers” on
page 62 for more information.
52
IBM 8265: User's Guide
Summary of Contents for 8265 Nways ATM Switch
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Page 17: ...Part 1 Configuring Your ATM Network Copyright IBM Corp 1994 1998 1...
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Page 107: ...Part 2 Managing the 8265 Copyright IBM Corp 1994 1998 91...
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