[nsp] Cisco 2600 with 8 bri's to make Multilink bundle

From: Olivier Dauby (olivier@be.wanadoo.com)
Date: Sun Oct 01 2000 - 18:15:55 EDT


Hi *,

I'm having some troubles while trying to make a multilink connection to
my ISP with multiple BRI interfaces.

Here is what I have:
        CISCO 2600
        8 BRI module (NM-8B-S/T)
        IOS 12.1(4)
        2 NT1 boxes ( = 2 ISDN lines)

I would like to use the 2 ISDN lines to make a 4 B-channels connection
to the Internet (my ISP allows me to make a 16 B-channels connection).
My isp is using
Ascend MAX TNT nases.

I can get the 4 B-channels to be connected to the Internet *BUT* I only
have a 128Kbits/sec bandwidth then. When I do a 'sh ppp multilink' I get
this:

Router#sh ppp multilink

Virtual-Access2, bundle name is 00c0.7b8e.51c4
  Dialer interface is Dialer0
  1 lost fragments, 1 reordered, 0 unassigned
  0 discarded, 0 lost received, 1/255 load
  0x8 received sequence, 0x0 sent sequence
  Member links: 2 (max not set, min not set)
    BRI1/1:2
    BRI1/0:2

Virtual-Access1, bundle name is 00c0.7b8c.9829
  Dialer interface is Dialer0
  1 lost fragments, 1 reordered, 0 unassigned
  0 discarded, 0 lost received, 23/255 load
  0x542 received sequence, 0x9DC sent sequence
  Member links: 2 (max not set, min not set)
    BRI1/1:1
    BRI1/0:1

I assume that having two Virtual-Access bundles is *NOT* a good thing.

Another thing not too funny is that I loose my Internet routing when the
4 B-channels are connected to my ISP

Here is the config:

Router#wr t
Building configuration...

Current configuration : 1601 bytes
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname streambox
!
enable password ...
!
!
!
!
!
ip subnet-zero
!
isdn switch-type basic-net3
!
!
!
interface Ethernet0/0
 ip address A.B.C.D 255.255.255.248
!
interface BRI1/0
 no ip address
 encapsulation ppp
 dialer rotary-group 0
 isdn switch-type basic-net3
!
interface BRI1/1
 no ip address
 encapsulation ppp
 dialer rotary-group 0
 isdn switch-type basic-net3
!
interface BRI1/2
 no ip address
 shutdown
 isdn switch-type basic-net3
!
interface BRI1/3
 no ip address
 shutdown
 isdn switch-type basic-net3
!
interface BRI1/4
 no ip address
 shutdown
 isdn switch-type basic-net3
!
interface BRI1/5
 no ip address
 shutdown
 isdn switch-type basic-net3
!
interface BRI1/6
 no ip address
 shutdown
 isdn switch-type basic-net3
!
interface BRI1/7
 no ip address
 shutdown
 isdn switch-type basic-net3
!
interface Dialer0
 ip unnumbered Ethernet0/0
 encapsulation ppp
 no ip mroute-cache
 shutdown
 dialer in-band
 dialer idle-timeout 300
 dialer map ip W.X.Y.Z POPnumber
 dialer load-threshold 1 outbound
 dialer-group 1
 ppp authentication pap callin
 ppp chap refuse
 ppp pap sent-username papuserid password ...
 ppp multilink
!
no ip classless
ip route 0.0.0.0 0.0.0.0 W.X.Y.Z
ip route W.X.Y.Z 255.255.255.255 Dialer0
no ip http server
!
dialer-list 1 protocol ip permit
!
line con 0
 transport input none
line aux 0
line vty 0 4
 password ...
 login
!
end

Got a clue ? drop me a line...

TIA!

O.

-- 
Dauby Olivier
Wanadoo Belgium
Network Operation Center



This archive was generated by hypermail 2b29 : Sun Aug 04 2002 - 04:12:18 EDT