10-15-2002 10:40 AM - edited 03-02-2019 02:05 AM
What can I do here since my client has overlaping IP address in
different buildings. The main building connects to building 1 and to
building 2, building 3 connects to building 2.
main building-----------------------------building 1
|
|
building 2----------------------------------building 3
I didn't configure this, but we added the backup to all the buildings.
Now I get overlaping address when I try to do a no shut on the
interfaces. In the network x.x.x.x, should I only specify what
network that are assigned and specific interface address.
Each building is almost it's own....
10.1.0.0
10.2.0.0
10.3.0.0
10.4.0.0
All the buildings have a network 10.0.0.0.......
The problem is with the 10.10.0.0 address configured... one building
will have an interface configured with 10.10.1.2 & 10.10.1.4. The
other building will have 10.10.1.3 & 10.10.1.5. How can I work around
this so I can still have my backup links failover.
Thanks!
Here is some of the config:
Main Building:
interface FastEthernet46
description Backup 11Mbps WAN to Building 1
ip address 10.10.2.3 255.255.255.0
no ip directed-broadcast
shutdown
ipx network AA1 encapsulation SAP
bridge-group 1
!
interface FastEthernet47
description Backup 11Mbps WAN to Building 2
ip address 10.10.4.3 255.255.255.0
no ip directed-broadcast
shutdown
ipx network AA3 encapsulation SAP
bridge-group 1
!
interface FastEthernet48
description Primary 100Mbps WAN to Building 1
ip address 10.10.2.1 255.255.255.0
no ip directed-broadcast
ipx network AAA1 encapsulation SAP
bridge-group 1
!
interface GigabitEthernet49
description Primary Gig WAN to Building 2
ip address 10.10.4.1 255.255.255.0
no ip directed-broadcast
ipx network AAA3 encapsulation SAP
bridge-group 1
!
interface GigabitEthernet50
description Connection to internal LAN
ip address 10.4.0.2 255.255.255.0
no ip directed-broadcast
ipx network A0 encapsulation SAP
bridge-group 1
!
router eigrp 1
network 10.0.0.0
!
router rip
redistribute eigrp 1
network 10.0.0.0
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.4.0.3
Building 1
interface FastEthernet0/0
description Connection to internal LAN
ip address 10.1.0.1 255.255.255.0
no ip mroute-cache
duplex auto
speed auto
ipx network 230F encapsulation SAP
no mop enabled
bridge-group 1
!
interface FastEthernet0/1
description FE WAN to Main Building
ip address 10.10.2.2 255.255.255.0
no ip mroute-cache
duplex auto
speed auto
ipx network AAA1 encapsulation SAP
ipx output-sap-filter 1000
bridge-group 1
!
interface Ethernet1/0
description Backup 11Mbps WAN to Main Building
ip address 10.10.2.4 255.255.255.0
shutdown
half-duplex
ipx network AA1 encapsulation SAP
ipx output-sap-filter 1000
bridge-group 1
!
router eigrp 1
network 10.0.0.0
no auto-summary
no eigrp log-neighbor-changes
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.10.2.1
no ip http server
Building 2
interface FastEthernet45
description Backup 11Mbps WAN to Main Building
ip address 10.10.4.4 255.255.255.0
no ip directed-broadcast
shutdown
ipx network AA3 encapsulation SAP
bridge-group 1
!
interface FastEthernet46
description Backup 11Mbps WAN to Building 3
ip address 10.10.1.5 255.255.255.0
no ip directed-broadcast
shutdown
ipx network AA2 encapsulation SAP
bridge-group 1
!
interface FastEthernet47
description connection to internal LAN
ip address 10.2.0.1 255.255.255.0
no ip directed-broadcast
ipx network 230C encapsulation SAP
bridge-group 1
!
interface FastEthernet48
description Primary 100Mpbs WAN to Building 3
ip address 10.10.1.3 255.255.255.0
no ip directed-broadcast
ipx network AAA2 encapsulation SAP
bridge-group 1
!
interface GigabitEthernet49
no ip address
no ip directed-broadcast
shutdown
!
interface GigabitEthernet50
description Primary Gig WAN to Main Building
ip address 10.10.4.2 255.255.255.0
no ip directed-broadcast
ipx network AAA3 encapsulation SAP
ipx output-sap-filter 1000
bridge-group 1
!
router eigrp 1
network 10.0.0.0
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.10.4.1
Building 3
interface FastEthernet0/0
description Connection to internal LAN
ip address 10.3.0.1 255.255.255.0
duplex auto
speed auto
ipx network 230A encapsulation SAP
no mop enabled
bridge-group 1
!
interface FastEthernet0/1
description Primary 100Mbps WAN to Building 2
ip address 10.10.1.2 255.255.255.0
speed 100
full-duplex
ipx network AAA2 encapsulation SAP
ipx output-sap-filter 1000
bridge-group 1
!
interface Ethernet1/0
description Backup 11Mbps WAN to Building 2
ip address 10.10.1.4 255.255.255.0
shutdown
half-duplex
ipx network AA2 encapsulation SAP
ipx output-sap-filter 1000
bridge-group 1
!
router eigrp 1
network 10.0.0.0
no auto-summary
no eigrp log-neighbor-changes
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.10.1.3
no ip http server
10-15-2002 11:37 AM
the main building & building 1 do not have 'no auto-summary' configured under Router eigrp 1. Try this
10-15-2002 11:55 AM
Usually I see two options when overlapping:
1) renumber so the IPs don't overlap (let eigrp routing do the work, easy to do)
2) Use nat so that you can have overlapping addresses: http://www.cisco.com/en/US/tech/tk648/tk361/technologies_configuration_example09186a0080093f30.shtml
But in your case you want on building3 f0/1 and f1/0 to be on the same subnet. Again I see 2 options:
1) renumber the backup interface and let routing do the backup/failover for you (preferred and easy - why do they need the same subnet?).
2) use a bvi interface and put the IP on it, place the interfaces you want in the bvi group. Force one interface to be active. Depending on your needs it may or may not work.
By the way, you should add a default-metric command for redistributing eigrp 1 into rip (on the main building). Also add no auto-sum on all eigrps.
Hope it helps.
Steve
10-15-2002 01:26 PM
Well.... I think I will use a 10.10.3.X, 10.10.6.X, and a 10.10.7.X for the backup.
How should I add a default-metric command for redistributing eigrp 1 into rip (on the main building).
Thanks!
10-15-2002 01:59 PM
You can be specific to eigrp (eg redistribute eigrp metric 2 - assigns the eigrp-derived routes a RIP metric of 2) or general to all protocols being redistributed into rip, eg:
!
router rip
redistribute eigrp 1
default-metric 2 (all redistributed routes, eigrp and ospf for example if it were present, a metric of 2)
network 10.0.0.0
!
A default metric helps solve the problem of redistributing routes with incompatible metrics. Whenever metrics do not convert, using a default metric provides a reasonable substitute and enables the redistribution to proceed.
Rip understands hops, eigrp understands bandwidth and delay.
Steve
10-16-2002 02:16 PM
I did configure the default metric and EIGRP lost all it's routes. I had to remove the command and issue a reload. Is this a normal thing?
10-16-2002 04:14 PM
You only entered :
router rip
redistribute eigrp 1
default-metric 2
network 10.0.0.0
on the main building router and it lost it's eigrp routes? That is not normal, eigrp should be unaffected. You aren't redistributing rip into eigrp as well are you (if you were to you would need filters to prevent potential routing loops)? Were the RIP routes still there? Is the no auto-sum on the eigrp process?
As a side note do you even need RIP and/or redistrib eigrp into it?
Steve
10-16-2002 05:14 PM
Yes... I entered:
router rip
redistribute eigrp 1
default-metric 2
network 10.0.0.0
The next thing I knew I lost connection to all the other buildings. I did a show Ip route and all there was, was the directly connected routes. Here is part of the new config.
Main Building:
interface FastEthernet46
description Backup 11Mbps WAN to Building 2
ip address 10.10.20.3 255.255.255.0
no ip directed-broadcast
ipx network AA1 encapsulation SAP
bridge-group 1
!
interface FastEthernet47
description Backup 11Mbps WAN to Building 1
ip address 10.10.40.1 255.255.255.0
no ip directed-broadcast
ipx network AA3 encapsulation SAP
bridge-group 1
!
interface FastEthernet48
description Primary 100Mbps WAN to Building 2
ip address 10.10.2.1 255.255.255.0
no ip directed-broadcast
ipx network AAA1 encapsulation SAP
bridge-group 1
!
interface GigabitEthernet49
description Primary Gig WAN to Building 1
ip address 10.10.4.1 255.255.255.0
no ip directed-broadcast
ipx network AAA3 encapsulation SAP
bridge-group 1
!
interface GigabitEthernet50
description Connection to internal LAN
ip address 10.4.0.2 255.255.255.0
no ip directed-broadcast
ipx network A0 encapsulation SAP
bridge-group 1
!
router eigrp 1
network 10.0.0.0
no auto-summary
!
router rip
redistribute eigrp 1
network 10.0.0.0
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.4.0.3
Building 2
interface FastEthernet0/0
description Connection to internal LAN
ip address 10.1.0.1 255.255.255.0
no ip mroute-cache
duplex auto
speed auto
ipx network 230F encapsulation SAP
no mop enabled
bridge-group 1
!
interface FastEthernet0/1
description FE WAN to Main Building
ip address 10.10.2.2 255.255.255.0
no ip mroute-cache
duplex auto
speed auto
ipx network AAA1 encapsulation SAP
ipx output-sap-filter 1000
bridge-group 1
!
interface Ethernet1/0
description Backup 11Mbps WAN to Main Building
ip address 10.10.20.2 255.255.255.0
full-duplex
ipx network AA1 encapsulation SAP
ipx output-sap-filter 1000
bridge-group 1
!
router eigrp 1
network 10.0.0.0
no auto-summary
no eigrp log-neighbor-changes
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.10.2.1
no ip http server
11-03-2002 09:54 PM
EIGRP works sort of well, but the issue is that only if the ethernet side goes down will EIGRP failover to the backup link. When we shut the radio side of the wireless bridge down, the ethernet port was still up on the bridge. EIGRP did not fail over to the backup link. What can I do to make sure that the failover workes in this situation. Is there a way to track the other side.
Thanks!
11-05-2002 04:34 PM
Would just creating static routes to the primary interface on the other side help sove my issues?
10-15-2002 01:21 PM
What will this do..... I will configure it though. Thanks!
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