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Question : Problem: Can't ping remote router interface over a bridged Multilink PPP connection.
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I know this must be something simple - but I can't find any relevant information.
I have two 2620s setup to use a multilink
interface to combine two T1s into a single
fat pipe. IP routing is off and I'm simply
bridging the two nets.
----------
| | gateway to internet
----------
|
| LAN-A 10.10.x.x
---------------------------------------
|
|
----------
| | 2620-A
----------
| |
| |
T1-A | | T1-B
| |
| |
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| | 2620-B
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| LAN-B 10.10.x.x
------------------------------------------------
All the hosts on LAN-A can ping hosts on
LAN-B and vice verse. Everything seems to
work fine....
EXCEPT...
If I try to telnet to or ping the Fastethernet
interface on the remote segment I can't?
The symptoms are the same for hosts on LAN-A
trying to reach 2620-B or the hosts on LAN-B
trying to reach the hosts on LAN-A.
Also - from either routers CLI I can't ping
anything on the remote end.
Any help is greatly appreciated.
Router configs below:
2620-A
Using 1402 out of 29688 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
service password-encryption
service udp-small-servers
service tcp-small-servers
!
hostname blah
!
enable secret blah
!
ip subnet-zero
no ip routing
!
!
ip name-server blah
!
!
!
!
interface Multilink1
no ip address
no ip route-cache
no ip mroute-cache
load-interval 30
arp arpa
arp timeout 0
no cdp enable
ppp multilink
multilink load-threshold 1 either
no ppp multilink fragmentation
multilink-group 1
bridge-group 1
!
interface FastEthernet0/0
ip address 10.10.10.254 255.255.0.0
no ip route-cache
no ip mroute-cache
no keepalive
speed auto
full-duplex
bridge-group 1
!
interface Serial0/0
bandwidth 1536
ip unnumbered Multilink1
encapsulation ppp
no ip route-cache
no ip mroute-cache
no fair-queue
ppp multilink
multilink-group 1
!
interface Serial0/1
bandwidth 1536
ip unnumbered Multilink1
encapsulation ppp
no ip route-cache
no ip mroute-cache
no fair-queue
ppp multilink
multilink-group 1
!
ip classless
no ip http server
!
snmp-server community public RO
no snmp-server enable traps tty
bridge 1 protocol ieee
!
line con 0
exec-timeout 0 0
password 7 blah
login
line aux 0
line vty 0 4
password 7 blah
login
!
end
2620-B
Using 1354 out of 29688 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
service password-encryption
service udp-small-servers
service tcp-small-servers
!
hostname blah
!
enable secret 5 blah
!
ip subnet-zero
no ip routing
!
!
ip name-server 10.10.20.11
!
!
!
!
interface Multilink1
no ip address
encapsulation ppp
no ip route-cache
no ip mroute-cache
load-interval 30
ppp multilink
multilink load-threshold 1 either
no ppp multilink fragmentation
bridge-group 1
!
interface FastEthernet0/0
ip address 10.10.20.254 255.255.0.0
no ip route-cache
no ip mroute-cache
no keepalive
speed auto
full-duplex
bridge-group 1
!
interface Serial0/0
bandwidth 1536
ip unnumbered Multilink1
encapsulation ppp
no ip route-cache
no ip mroute-cache
no fair-queue
ppp multilink
multilink-group 1
!
interface Serial0/1
bandwidth 1536
ip unnumbered Multilink1
encapsulation ppp
no ip route-cache
no ip mroute-cache
no fair-queue
ppp multilink
multilink-group 1
!
ip classless
no ip http server
!
snmp-server community public RO
no snmp-server enable traps tty
bridge 1 protocol ieee
!
line con 0
exec-timeout 0 0
password 7 blah
login
line aux 0
line vty 0 4
password 7 blah
login
!
end
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Answer : Problem: Can't ping remote router interface over a bridged Multilink PPP connection.
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If you have IP routing disabled, then there will be no processing of IP packets.
You can use Integrated Routing and Bridging (IRB) if you need to process IP packets and bridge at the same time.
Remove the ip address from the fastethernet interface and add these lines.
ip routing
bridge irb
interface bvi 1
ip address 10.10.10.254 255.255.0.0
This should give you an ip address you can talk to.
-Don
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