- Enterasys Security Router User's Guide
ISDN Configuration
11-14 Configuring Integrated Services Digital Network
Be aware that the isdn bchan-number-order command forces the PRI interface to make outgoing
calls in ascending or descending order. The command is recommended only if your service
provider requests it to lessen the chance of call collisions.
Leased-Line Configuration Model
The BRI Leased Line application supports two basic modes: each B channel is routed to a different
destination or both B channels are bounded. Only one BRI-specific command is needed for this
application,
leased-line, which can be configured at 56, 64, 112, 128, or 144 Kbps.
Figure 11-3 illustrates how a Leased Line application is configured on the XSR’s BRI NIM card
(XSR 1800/3000 Series) with either PPP or Frame Relay encapsulation.
Figure 11-3 BRI Leased Line Application
The following commands, as shown in Figure 11-3, add two leased lines on BRI 0//1/1 B-
channels 1 and 2 with PPP and Frame Relay encapsulation on either line. You can add other serial
interface commands as needed..
XSR(config)#interface bri 0/1/1
XSR(config-if<BRI-1/1>)#leased-line bri 0/1/1 56
XSR(config-if<BRI-1/1>)#leased-line bri 0/1/1 56
XSR(config-if<BRI-1/1>)#no shutdown
XSR(config)#interface bri 0/1/1:1
XSR(config-if<BRI-1/1:1>)#ip address 1.1.1.2 255.255.255.0
XSR(config-if<BRI-1/1:1>)#encapsulation ppp
XSR(config-if<BRI-1/1:1>)#no shutdown
XSR(config)#interface bri 0/1/1:2
Note: Be aware that two data streams are supported, one on each B channel, at 56 and 64 Kbps
only, and one data stream is supported over the bounded B1 + B2 or B1+B2+D line at 112, 128, or
144 Kbps only.
Note: ISDN BRI can be configured on XSR 1200 Series routers but only on interface BRI 0:<1-
2>.<1-30>. All BRI examples in this chapter reference Ethernet interfaces on XSR 1800/3000
Series routers.
LL
interface BRI 0/1/1
leased-line BRI 1/1 112|128|144
interface BRI 0/1/1:2
ip address 1.1.1.3
255.255.255.0
encapsulation FR
... any serial interface
command
interface BRI 0/1/1:1
ip address 1.1.1.2
255.255.255.0
encapsulation ppp
... any serial interface
command
Leased S/T or U BRI line
B2
B1
IP
interface BRI 0/1/2:1
ip address 1.1.1.3 255.255.255.0
encapsulation FR
... any serial interface command
LL
Leased S/T or U BRI line
interface BRI 0/1/1
leased-line BRI 0/1/1 56 | 64
leased-line BRI 0/1/1 56 | 64