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Gateway Routing - multiple gateways

Posted on 2006-11-02
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Last Modified: 2013-12-12
Current HQ Subnet:  172.16.77.XXX
Company A Gateway Router: 172.16.77.1
Company B Gateway Router: 172.16.77.245
Remote subnet for Company B:  172.16.60.XXX  [Where I want to route the 172.16.60.XXX traffic to]

We are going to be changing our WAN providers.  We use Company A right now and our default gateway points through their router.

We have just brought in Company B's router and it is supposed to connect to our first MPLS site [the Remote Subnet above]

We are going to be using the same subnets for existing sites for obvious reasons, however I need to make sure that traffic routing to the new site is sent and routed to that site using Company B's router.

I tried adding a static IP route 172.16.60.0 255.255.255.0 172.16.77.245  to the routing table on Company A's router.  However if I perform a trace route 172.16.60.1 off of Company A's router it traverses the gateway and heads out our internet router.

We use EIGRP.

How can I route the 172.16.60.XXX traffic through the Company B router and vice versa?

Thank You!

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Question by:EnclosAdmin
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by:Don Johnston
ID: 17874638
I'm not sure I understand what you're doing.

Are company A and B connected to each other or is A and B different providers?

Can you post a topology diagram?
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by:EnclosAdmin
ID: 17875515
Widgets is the Customer who has been using Customer A as a WAN provider for 6 years.

Widgets is switching to company B slowly.  So Widgets has opened a new office in Utah and it will be the first office conected to Widgets by Company B.  Of course Company B has to place a Router at Widgets HQ office for connectivity to the Utah site.

So now both WAN providers have routers at Widgets HQ location.  What that means for users at Widgets is that they now have two distinct gateways.  They will need to route traffic between the sites.  So all of the original users still on Company A's WAN need to get to resources in Company B's WAN and vice versa.

We use EIGRP, so everybody in the Widget company has a default gateway that brings them back to the Widget HQ office.  I can create a static route to the Company B router.  A traceroute shows that the traffic routed to Utah does indeed hit the Company B router in Widgets HQ office but it then comes right back into the Wiget HQ office and tried heading out the internet.
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by:Don Johnston
ID: 17876156
>tried heading out the internet.

Where does the internet come in??? Do you have a seperate router somewhere that connects to the internet?

Are you sure a PVC has been established by Company B?
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by:EnclosAdmin
ID: 17876947
There are 5 Global T1's coming into Widgets and now a new Broadwing T1.

It only complicates the issue to add them.  They are internet T's and a PRI for DID and caller ID.  However the problem isn't any of them, it is routing to the Company B router through Widgets HQ site to the site in Utah.  Obviously traffic returned from the Company B router that never made it to Utah in the first place will traverse towards the internet because the router will see that as traffic that has no route and route it to the internet.

The Company B router can PING its Utah router and the Utah router can PING COmpany B's router in the HQ office.  I can route the traffic from any Company A router to the Company B HQ router but the traffic fails to traverse through that router to the Utah site.
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by:Don Johnston
ID: 17877663
Can you post the routing table for the HQ and Utah routers?
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by:EnclosAdmin
ID: 17885173
Company B's EAGAN router:
EAGAN_RTR#sho ip ro
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 10.0.132.41 to network 0.0.0.0

     172.16.0.0/24 is subnetted, 1 subnets
C       172.16.77.0 is directly connected, FastEthernet0/0
     172.26.0.0/32 is subnetted, 1 subnets
C       172.26.77.245 is directly connected, Loopback0
     10.0.0.0/30 is subnetted, 1 subnets
C       10.0.132.40 is directly connected, Serial0/0/0:0.1
S*   0.0.0.0/0 [1/0] via 10.0.132.41

Company B's UTAH Router:
ST_GEORGE_RTR#sho ip ro
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 10.0.132.21 to network 0.0.0.0

     172.16.0.0/24 is subnetted, 1 subnets
C       172.16.60.0 is directly connected, FastEthernet0/0
     172.26.0.0/32 is subnetted, 1 subnets
C       172.26.60.1 is directly connected, Loopback0
     10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C       10.0.132.20/30 is directly connected, Serial0/0/0
C       10.0.132.21/32 is directly connected, Serial0/0/0
S*   0.0.0.0/0 [1/0] via 10.0.132.21

Company A Catalyst 4506 switch:
[This has a static IP route to the Company B EAGAN router for UTAH's SUBNET]
MSPSR1#sho ip ro
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 172.16.200.2 to network 0.0.0.0

S    172.17.0.0/16 [1/0] via 172.16.200.2
     172.16.0.0/16 is variably subnetted, 28 subnets, 3 masks
D       172.16.254.64/30 [90/21024256] via 172.16.77.253, 4d04h, Vlan77
D       172.16.254.68/30 [90/11024128] via 172.16.77.253, 4d04h, Vlan77
C       172.16.177.0/24 is directly connected, Vlan177
D       172.16.254.80/30 [90/7178752] via 172.16.77.253, 3d05h, Vlan77
D       172.16.254.84/30 [90/2178816] via 172.16.77.253, 4d04h, Vlan77
D       172.16.254.100/30 [90/2178816] via 172.16.77.253, 4d04h, Vlan77
D       172.16.254.108/30 [90/2178816] via 172.16.77.253, 4d04h, Vlan77
D       172.16.254.116/30 [90/11024128] via 172.16.77.253, 4d04h, Vlan77
D       172.16.250.4/30 [90/17800192] via 172.16.200.105, 7w0d, Vlan200
D       172.16.250.8/30 [90/16316672] via 172.16.200.105, 7w0d, Vlan200
D       172.16.254.28/30 [90/2178816] via 172.16.77.253, 4d04h, Vlan77
D       172.16.217.0/24 [90/2181376] via 172.16.77.253, 4d04h, Vlan77
D       172.16.254.40/30 [90/2178816] via 172.16.77.253, 4d04h, Vlan77
D       172.16.214.0/24 [90/2181376] via 172.16.77.253, 4d04h, Vlan77
C       172.16.200.0/24 is directly connected, Vlan200
D       172.16.254.56/30 [90/2178816] via 172.16.77.253, 4d04h, Vlan77
S       172.16.60.0/24 [1/0] via 172.16.77.245
D       172.16.55.0/24 [90/2181376] via 172.16.77.253, 4d04h, Vlan77
D       172.16.254.132/30 [90/5512192] via 172.16.77.253, 4d04h, Vlan77
D       172.16.195.176/32 [90/24820992] via 172.16.77.11, 04:06:59, Vlan77
D       172.16.108.0/24 [90/2181376] via 172.16.77.253, 4d04h, Vlan77
D       172.16.106.0/24 [90/2181376] via 172.16.77.253, 4d04h, Vlan77
D       172.16.107.0/24 [90/5514752] via 172.16.77.253, 19:37:36, Vlan77
D       172.16.101.0/24 [90/2181376] via 172.16.77.253, 3d02h, Vlan77
D       172.16.102.0/24 [90/5514752] via 172.16.77.253, 4d04h, Vlan77
D       172.16.103.0/24 [90/7181312] via 172.16.77.253, 3d05h, Vlan77
C       172.16.77.0/24 is directly connected, Vlan77
D       172.16.66.0/24 [90/5512192] via 172.16.77.253, 2d12h, Vlan77
S    172.21.0.0/16 [1/0] via 172.16.200.21
S    172.22.0.0/16 [1/0] via 172.16.200.105
     172.26.0.0/32 is subnetted, 11 subnets
D       172.26.77.254 [90/130816] via 172.16.77.254, 7w0d, Vlan77
D       172.26.77.253 [90/130816] via 172.16.77.253, 4d04h, Vlan77
D       172.26.214.1 [90/2306816] via 172.16.77.253, 4d04h, Vlan77
D       172.26.217.1 [90/2306816] via 172.16.77.253, 4d04h, Vlan77
D       172.26.55.1 [90/2306816] via 172.16.77.253, 4d04h, Vlan77
D       172.26.103.1 [90/7306752] via 172.16.77.253, 3d05h, Vlan77
D       172.26.102.1 [90/5640192] via 172.16.77.253, 4d04h, Vlan77
D       172.26.101.1 [90/2306816] via 172.16.77.253, 4d04h, Vlan77
D       172.26.108.1 [90/2306816] via 172.16.77.253, 4d04h, Vlan77
D       172.26.107.1 [90/5640192] via 172.16.77.253, 19:37:36, Vlan77
D       172.26.106.1 [90/2306816] via 172.16.77.253, 4d04h, Vlan77
     10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
D       10.16.107.0/24 [90/5514752] via 172.16.77.253, 19:37:36, Vlan77
D       10.16.102.0/24 [90/5514752] via 172.16.77.253, 4d04h, Vlan77
D       10.16.103.0/24 [90/7181312] via 172.16.77.253, 3d05h, Vlan77
D       10.26.177.9/32 [90/130816] via 10.16.177.9, 7w0d, Vlan377
D       10.26.177.8/32 [90/130816] via 10.16.177.8, 7w0d, Vlan377
C       10.16.177.0/24 is directly connected, Vlan377
S    198.17.220.0/24 [1/0] via 172.16.200.22
S*   0.0.0.0/0 [1/0] via 172.16.200.2
S    192.168.0.0/16 [1/0] via 172.16.200.2

Company A Frame Relay Router
[This also has a Static IP Route to Company B's EAGAN router for UTAH's subnet]
MSPRT1#sho ip ro
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
       * - candidate default, U - per-user static route, o - ODR
       P - periodic downloaded static route

Gateway of last resort is 172.16.77.1 to network 0.0.0.0

D EX 172.17.0.0/16 [170/28416] via 172.16.77.1, 4d04h, FastEthernet0/0.77
     172.16.0.0/16 is variably subnetted, 28 subnets, 3 masks
D       172.16.254.64/30 [90/21024000] via 172.16.254.58, 1w2d, Serial0/0.101
D       172.16.254.68/30 [90/11023872] via 172.16.254.42, 2w0d, Serial0/0.106
                         [90/11023872] via 172.16.254.30, 2w0d, Serial1/0.155
D       172.16.177.0/24 [90/28416] via 172.16.77.1, 4d04h, FastEthernet0/0.77
C       172.16.254.80/30 is directly connected, Serial0/0.160
C       172.16.254.84/30 is directly connected, Serial0/0.114
C       172.16.254.100/30 is directly connected, Serial0/0.117
C       172.16.254.108/30 is directly connected, Serial1/0.162
D       172.16.254.116/30
           [90/11023872] via 172.16.254.102, 2w0d, Serial0/0.117
D       172.16.250.4/30
           [90/17802752] via 172.16.77.1, 4d04h, FastEthernet0/0.77
D       172.16.250.8/30
           [90/16319232] via 172.16.77.1, 4d04h, FastEthernet0/0.77
C       172.16.254.28/30 is directly connected, Serial1/0.155
D       172.16.217.0/24 [90/2181120] via 172.16.254.102, 2w3d, Serial0/0.117
C       172.16.254.40/30 is directly connected, Serial0/0.106
D       172.16.214.0/24 [90/2181120] via 172.16.254.86, 2w0d, Serial0/0.114
D       172.16.200.0/24 [90/28416] via 172.16.77.1, 4d04h, FastEthernet0/0.77
C       172.16.254.56/30 is directly connected, Serial0/0.101
S       172.16.60.0/24 [1/0] via 172.16.77.245
D       172.16.55.0/24 [90/2181120] via 172.16.254.30, 2w0d, Serial1/0.155
C       172.16.254.132/30 is directly connected, Serial1/0.163
D       172.16.195.176/32
           [90/24823296] via 172.16.77.11, 04:08:50, FastEthernet0/0.77
D       172.16.108.0/24 [90/2181120] via 172.16.254.110, 2w0d, Serial1/0.162
D       172.16.106.0/24 [90/2181120] via 172.16.254.42, 2w0d, Serial0/0.106
D       172.16.107.0/24 [90/5514496] via 172.16.66.2, 19:39:27, Serial0/0.161
D       172.16.101.0/24 [90/2181120] via 172.16.254.58, 3d02h, Serial0/0.101
D       172.16.102.0/24 [90/5514496] via 172.16.254.134, 2w0d, Serial1/0.163
D       172.16.103.0/24 [90/7181056] via 172.16.254.82, 3d05h, Serial0/0.160
C       172.16.77.0/24 is directly connected, FastEthernet0/0.77
C       172.16.66.0/24 is directly connected, Serial0/0.161
D EX 172.21.0.0/16 [170/28416] via 172.16.77.1, 4d04h, FastEthernet0/0.77
D EX 172.22.0.0/16 [170/28416] via 172.16.77.1, 4d04h, FastEthernet0/0.77
     172.26.0.0/32 is subnetted, 11 subnets
D       172.26.77.254 [90/156160] via 172.16.77.254, 4d04h, FastEthernet0/0.77
C       172.26.77.253 is directly connected, Loopback0
D       172.26.214.1 [90/2306560] via 172.16.254.86, 2w0d, Serial0/0.114
D       172.26.217.1 [90/2306560] via 172.16.254.102, 2w3d, Serial0/0.117
D       172.26.55.1 [90/2306560] via 172.16.254.30, 2w0d, Serial1/0.155
D       172.26.103.1 [90/7306496] via 172.16.254.82, 3d05h, Serial0/0.160
D       172.26.102.1 [90/5639936] via 172.16.254.134, 2w0d, Serial1/0.163
D       172.26.101.1 [90/2306560] via 172.16.254.58, 1w2d, Serial0/0.101
D       172.26.108.1 [90/2306560] via 172.16.254.110, 2w0d, Serial1/0.162
D       172.26.107.1 [90/5639936] via 172.16.66.2, 19:39:27, Serial0/0.161
D       172.26.106.1 [90/2306560] via 172.16.254.42, 2w0d, Serial0/0.106
     10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
D       10.16.107.0/24 [90/5514496] via 172.16.66.2, 19:39:27, Serial0/0.161
D       10.16.102.0/24 [90/5514496] via 172.16.254.134, 2w0d, Serial1/0.163
D       10.16.103.0/24 [90/7181056] via 172.16.254.82, 3d05h, Serial0/0.160
D       10.26.177.9/32 [90/156416] via 172.16.77.1, 4d04h, FastEthernet0/0.77
D       10.26.177.8/32 [90/156416] via 172.16.77.1, 4d04h, FastEthernet0/0.77
D       10.16.177.0/24 [90/28416] via 172.16.77.1, 4d04h, FastEthernet0/0.77
D EX 198.17.220.0/24 [170/28416] via 172.16.77.1, 4d04h, FastEthernet0/0.77
D*EX 0.0.0.0/0 [170/28416] via 172.16.77.1, 4d04h, FastEthernet0/0.77
D EX 192.168.0.0/16 [170/28416] via 172.16.77.1, 4d04h, FastEthernet0/0.77


So here's waht we get:

User if they are plugged into the Catalyst switch in EAGAN they can get to Utah's resources.  If they are not plugged into that switch they cannot get to Utah's resources.  The Company A Frame Relay Router can ping both of the Company B routers but nobody routing through that router can get there.

Utah users coming to Eagan from Company B's UTAH router can't get to anything on the Company A side.
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by:Don Johnston
ID: 17885710
I can't determine how your HQ and Utah sites are connected. There doesn't appear to be a common network between them.

Can you provide a topology diagram so I see how there four routers/switches are connected?
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by:EnclosAdmin
ID: 17885875
How can I post a diagram on this site?
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by:Don Johnston
ID: 17886270
Here's one way:

F/R router                                                         4500
     |                                                                     |
----------------- HQ----------------------------Utah------------------  
172.16.1.0           ^                              ^           172.16.2.0
                           |                               |
                    172.16.3.1                  172.16.3.2
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by:EnclosAdmin
ID: 17931576
Problem solved:

I set up redistribution for EIGRP from company A to OSPF on Company B - and redistribution for OSPF from Company B to EIGRP on Company A.

Company B wanted to utilize static IP's and were reluctant to allow a routing protocol.  They have since seen the light and have allowed OSPF.  Not as good as EIGRP but vastly superior and less complicated than static routing with so many subnets involved.

Thank you to those that had tried to figure this out.
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