11-09-2008 06:40 PM - edited 03-04-2019 12:15 AM
I have three routers connected to a central router I am using as a frame-relay switch.
Like so:
64.53.18.1
ISP
|
|
(Frame-Switch)
/ \
64.53.18.3 ....................64.53.18.2
West..............................East
I am also running NAT. Before I had the interfaces as int s0/0.DLCI point-to-point and ip ospf network broadcast. That worked fine until I rebooted my routers. I have tried many different things, but finally I am trying the configs below. It still doesn't work now.
I can't even ping the 64.53.18.1,2,3 interfaces!
Here are my configs:
ISP:
!
interface Serial0/0
no ip address
encapsulation frame-relay
no fair-queue
frame-relay lmi-type ansi
!
interface Serial0/0.101 multipoint
description PVC to West, DLCI 101
ip address 64.53.18.1 255.255.255.248
ip ospf network point-to-multipoint
frame-relay interface-dlci 101
!
interface Serial0/0.102 multipoint
description PVC to East, DLCI 102
ip address 64.53.18.1 255.255.255.248
ip ospf network point-to-multipoint
frame-relay interface-dlci 102
!
East:
!
interface Serial0/0
no ip address
ip nat outside
encapsulation frame-relay
frame-relay lmi-type ansi
!
interface Serial0/0.301 multipoint
ip address 64.53.18.2 255.255.255.248
ip ospf network point-to-multipoint
frame-relay interface-dlci 301
!
interface Serial0/0.302 multipoint
description PVC to East, DLCI 302
ip address 64.53.18.2 255.255.255.248
ip ospf network point-to-multipoint
frame-relay interface-dlci 302
!
interface Serial0/1
no ip address
shutdown
clockrate 2000000
!
router ospf 1
log-adjacency-changes
network 24.83.68.0 0.0.0.127 area 61
network 64.53.18.0 0.0.0.7 area 0
West:
!
interface Serial0/0
no ip address
ip nat outside
encapsulation frame-relay
no fair-queue
frame-relay lmi-type ansi
!
interface Serial0/0.201 multipoint
description PVC to ISP, DLCI 201
ip address 64.53.18.3 255.255.255.248
ip ospf network point-to-multipoint
frame-relay interface-dlci 201
!
interface Serial0/0.202 multipoint
description PVC to East, DLCI 202
ip address 64.53.18.3 255.255.255.248
ip ospf network point-to-multipoint
frame-relay interface-dlci 202
!
router ospf 1
log-adjacency-changes
network 64.53.18.0 0.0.0.7 area 0
network 161.73.29.0 0.0.0.63 area 51
!
................
Whenever I try to ping, I either get no ping or something that looks like this:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 64.53.18.3, timeout is 2 seconds:
.!.!.
Also when I do "sh ip route" I get the following:
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 not set
64.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
O 64.53.18.3/32 [110/64] via 64.53.18.3, 00:05:02, Serial0/0.302
O 64.53.18.1/32 [110/64] via 64.53.18.1, 00:05:02, Serial0/0.302
C 64.53.18.0/29 is directly connected, Serial0/0.301
is directly connected, Serial0/0.302
both "O" paths go through DLCI 302. One should go tru 302 and the other through 301, however.
Please help!
11-09-2008 06:57 PM
Hi Asha,
1. I would recommend you to use point-to-point subinterfaces like this:
interface Serial0/0.201 point-to-point
description PVC to ISP, DLCI 201
ip address 64.53.18.1 255.255.255.252
ip ospf network point-to-point
frame-relay interface-dlci 201
2. You ip addresses should be different on each subinterface:
interface Serial0/0.202 point-to-point
description PVC to ISP, DLCI 202
ip address 64.53.18.5 255.255.255.252
ip ospf network point-to-point
frame-relay interface-dlci 202
3. You should reconfigure all three routers similarly.
Don't forget to apply /30 subnets to each point-to-point connection.
Cheers:
Istvan
11-09-2008 07:01 PM
I am doing a lab and the interfaces must be all kept in the same subnet since I am using ospf... hence the 64.53.18.1, 64.53.18.2, 64.53.18.3 for the three respective routers.
11-09-2008 07:17 PM
In this case you need only one multipoint subinterface in each router with an ip address within the same subnet.
You will need to use the "frame-relay map" command on the multipoint subinterface to manually configure the next-hop - to - DLCI mappings.
Cheers:
Istvan
11-09-2008 07:28 PM
After I posted I ended up making a point to multipoint interface with both DLCIs like so:
interface Serial0/0.1 multipoint
description PVC to East, DLCI 201 - 202
ip address 64.53.18.3 255.255.255.248
ip ospf network point-to-multipoint
frame-relay interface-dlci 201
frame-relay interface-dlci 202
I don't have the "frame map" command, but now I can ping the other FR interfaces. However, I can't ping the connected LANs. Since I can ping the serial interfaces, do I still need the "frame map" command? Also anyone have any ideas why my NAT doesn't work now. Earlier it did. I don't know if changing to multipoint could have affected it.
(24.83.68.0/25 is the IP block I am using for NAT, 192.168.10.0/23 is the internal IPs)
interface Loopback10
ip address 24.83.68.1 255.255.255.128
ip ospf network point-to-point
!
interface FastEthernet0/0.1
encapsulation dot1Q 1 native
ip address 192.168.11.1 255.255.255.192
ip nat inside
!
interface FastEthernet0/0.10
encapsulation dot1Q 10
ip address 192.168.10.1 255.255.255.0
ip nat inside
!
interface FastEthernet0/0.20
encapsulation dot1Q 20
ip address 192.168.11.65 255.255.255.192
ip nat inside
!
interface FastEthernet0/0.30
encapsulation dot1Q 30
ip address 192.168.11.129 255.255.255.224
ip nat inside
!
!
router ospf 1
log-adjacency-changes
network 24.83.68.0 0.0.0.127 area 61
network 64.53.18.0 0.0.0.7 area 0
!
ip nat pool V1 24.83.68.33 24.83.68.46 netmask 255.255.255.240
ip nat pool Admin 24.83.68.2 24.83.68.30 netmask 255.255.255.224
ip nat inside source list 1 pool V1
ip nat inside source list 10 interface Loopback10 overload
ip nat inside source list 20 interface Loopback10 overload
ip nat inside source list 30 pool Admin
!
access-list 1 permit 192.168.11.0 0.0.0.63
access-list 10 permit 192.168.10.0 0.0.0.255
access-list 20 permit 192.168.11.64 0.0.0.63
access-list 30 permit 192.168.11.128 0.0.0.31
!
!
!
11-10-2008 01:54 AM
Hello Asha,
you actually have two FR NBMA networks here you need:
a) to use two different IP subnets or the second serial will be a simple backup: this is done on the field but with the idea of moving the cable to the backup interface so the second interface should be configured as the first one but left unconnected.
What you did shouldn't be a correct config even in a lab.
b)
you need the frame-relay map in order to successfully build OSPF adjacencies because that command allows you to add the broadcast keyword that implies the capability to send OSPF multicast hellos out the interface.
If you do you will be able to see the LAN segments
use
sh ip ospf interface
sh ip ospf neighbors
Hope to help
Giuseppe
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