Cisco 1003 - 1003 Router Bedienungsanleitung PDF herunterladen (Seite 29)

Designing ISDN Internetworks 11-29

Performance

in length are subject to fragmentation.) When the fragments of packets A and B arrive at the

receiving router, MP reassembles the original packets and sequences them correctly in the data

stream.

Figure 11-8 PPP Multilink

Note MP is currently processed switched. You need to consider performance in large hub

implementations that have multiple ISDN PRIs.

With constantly changing MP software on different vendors’ ISDN products, PPP interoperability

can never be guaranteed. To reduce interoperability problems, Cisco regularly participates in PPP

interoperability testing. For the latest test results, consult your technical support representative.

MP can be used with any Cisco ISDN BRI or PRI interface. MP can be used with other ISDN

features, such as PPP authentication, PPP compression (described in the “Compression” section later

in this chapter), PPP callback (described in the “Callback” section later in this chapter) and IP

address negotiation (described in the “IP Address Negotiation for ISDN” section earlier in this

chapter).

Dialer Rotary Groups

To increase the bandwidth of an ISDN connection beyond the 128-kbps limit of a single BRI,

aggregate multiple BRIs.

Step 1 Use the dialer rotary-group command to assign each BRI to a dialer rotary group.

Step 2 Use the interface dialer command to create a dialer interface.

Step 3 Apply network addresses and dialer map commands to the dialer interface.

Step 4 Use the dialer load-threshold command to bring into operation multiple ISDN BRIs in

the rotary group based on trafﬁc thresholds.

The following partial conﬁguration for Router A aggregates its two BRIs:

interface bri 0

dialer rotary-group 1

interface bri 1

dialer rotary-group 1

interface dialer 1

dialer load threshold 128

ip address 171.68.158.26 255.255.255.248

dialer map ip 171.68.158.27 name RouterC speed 64 4085551212

Sequencing and

fragmentation

Sequencing and

re-assembly

S4445

ISDN

Data in

B A

Data out

1 2 ... 24 25 26 27 28 29 30 31 32 33 34

Keine Kommentare

Cisco 1003 - 1003 Router Bedienungsanleitung Seite 29