Why Metric Of 2?

boostinbadger

Here is the show ip route of R2 on my rack:

R2_1760#show ip route
1.0.0.0/32 is subnetted, 1 subnets
R 1.1.1.1 [120/1] via 10.35.1.1, 00:00:25, Serial0/0
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0
33.0.0.0/32 is subnetted, 1 subnets
R 33.3.3.3 [120/2] via 10.35.1.3, 00:00:25, Serial0/0
3.0.0.0/32 is subnetted, 1 subnets
R 3.3.3.3 [120/2] via 10.35.1.3, 00:00:25, Serial0/0
55.0.0.0/32 is subnetted, 1 subnets
R 55.5.5.5 [120/2] via 10.35.1.3, 00:00:25, Serial0/0
10.0.0.0/16 is subnetted, 1 subnets
C 10.35.0.0 is directly connected, Serial0/0
44.0.0.0/32 is subnetted, 1 subnets
R 44.4.4.4 [120/2] via 10.35.1.3, 00:00:03, Serial0/0

When I ping 3.3.3.3, 33.3.3.3, 44.4.4.4, 55.5.5.5 it comes back failed. Why would this be? I can ping those IPs from any other router. Why is the metric 2 to those routes, but 1.1.1.1 which is on my R1 router has a metric of 1?

I am using RIPv2 with no auto-summary.

Morty3

Cant tell why you cant ping since no configs are posted. Maybe failed at encapsulation or no set clockrate somewhere?

boostinbadger

Clock rates are fine. I can ping from serial to serial on all three routers, but I can't ping loopbacks from r2. I will have to post the configs when I get home this evening.

boostinbadger

Here are the configs:

R1_1760#show conf
Using 929 out of 29688 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname R1_1760
!
boot-start-marker
boot system flash c1700-ipbasek9-mz.124-23.bin
boot-end-marker
!
no aaa new-model
ip cef
!
no ip domain lookup
!
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
no ip address
speed auto
!
interface Serial0/0
ip address 10.35.1.1 255.255.0.0
encapsulation frame-relay
no fair-queue
!
interface Serial0/1
no ip address
shutdown
!
router rip
version 2
network 1.0.0.0
network 10.0.0.0
no auto-summary
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
login
line aux 0
line vty 0 4
login
!
end



R2_1760#show conf
Using 914 out of 29688 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname R2_1760
!
boot-start-marker
boot system flash c1700-ipbasek9-mz.124-23.bin
boot-end-marker
!
no aaa new-model
ip cef
!
no ip domain lookup
!
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
no ip address
speed auto
!
interface Serial0/0
ip address 10.35.1.2 255.255.0.0
encapsulation frame-relay
!
interface Serial0/1
no ip address
shutdown
!
router rip
version 2
network 2.0.0.0
network 10.0.0.0
no auto-summary
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
control-plane
!
!
line con 0
exec-timeout 0 0
logging synchronous
login
line aux 0
line vty 0 4
login
!
end



R3_1760#show conf
Using 1098 out of 29688 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname R3_1760
!
boot-start-marker
boot-end-marker
!
no aaa new-model
ip cef
!
no ip domain lookup
!
interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface Loopback1
ip address 33.3.3.3 255.255.255.255
!
interface Loopback2
ip address 44.4.4.4 255.255.255.255
!
interface Loopback3
ip address 55.5.5.5 255.255.255.255
!
interface FastEthernet0/0
no ip address
speed auto
!
interface Serial0/0
ip address 10.35.1.3 255.255.0.0
encapsulation frame-relay
!
interface Serial0/1
no ip address
shutdown
!
router rip
version 2
network 3.0.0.0
network 10.0.0.0
network 33.0.0.0
network 44.0.0.0
network 55.0.0.0
no auto-summary
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
login
line aux 0
line vty 0 4
login
!
end

R1 can ping all interfaces including loopbacks. R2 and R3 can ping R1 but no interfaces between them.

gojericho0

when you do a traceroute does it get to the other routers serial addresses?

you can also do a debug ip packet detail on both ends to see if there is a problem as well

dtlokee

Looks like you are using a frame relay are all of the routers fully meshed? What does your "sh frame pvc" output look like?

boostinbadger

FRS_2612#show frame pvc

PVC Statistics for interface Serial0/0 (Frame Relay DCE)

Active Inactive Deleted Static
Local 0 0 0 0
Switched 2 0 0 0
Unused 0 0 0 0

DLCI = 122, DLCI USAGE = SWITCHED, PVC STATUS = ACTIVE, INTERFACE = Serial0/0

input pkts 9281 output pkts 9284 in bytes 1538186
out bytes 1539314 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 0 out bcast bytes 0
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
switched pkts 9281
Detailed packet drop counters:
no out intf 0 out intf down 0 no out PVC 0
in PVC down 0 out PVC down 0 pkt too big 0
shaping Q full 0 pkt above DE 0 policing drop 0
pvc create time 6d19h, last time pvc status changed 5d01h

DLCI = 123, DLCI USAGE = SWITCHED, PVC STATUS = ACTIVE, INTERFACE = Serial0/0

input pkts 9323 output pkts 9311 in bytes 1542114
out bytes 1541402 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 0 out bcast bytes 0
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
switched pkts 9323
Detailed packet drop counters:
no out intf 0 out intf down 0 no out PVC 0
in PVC down 0 out PVC down 0 pkt too big 0
shaping Q full 0 pkt above DE 0 policing drop 0
pvc create time 6d19h, last time pvc status changed 5d01h

PVC Statistics for interface Serial0/1 (Frame Relay DCE)

Active Inactive Deleted Static
Local 0 0 0 0
Switched 1 0 0 0
Unused 0 0 0 0

DLCI = 221, DLCI USAGE = SWITCHED, PVC STATUS = ACTIVE, INTERFACE = Serial0/1

input pkts 9286 output pkts 9281 in bytes 1539524
out bytes 1538186 dropped pkts 2 in pkts dropped 2
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 0 out bcast bytes 0
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
switched pkts 9285
Detailed packet drop counters:
no out intf 0 out intf down 0 no out PVC 0
in PVC down 0 out PVC down 2 pkt too big 0
shaping Q full 0 pkt above DE 0 policing drop 0
pvc create time 6d19h, last time pvc status changed 5d01h

PVC Statistics for interface Serial0/2 (Frame Relay DCE)

Active Inactive Deleted Static
Local 0 0 0 0
Switched 1 0 0 0
Unused 0 0 0 0

DLCI = 321, DLCI USAGE = SWITCHED, PVC STATUS = ACTIVE, INTERFACE = Serial0/2

input pkts 9312 output pkts 9323 in bytes 1541436
out bytes 1542114 dropped pkts 2 in pkts dropped 2
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 0 out bcast bytes 0
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
switched pkts 9311
Detailed packet drop counters:
no out intf 0 out intf down 0 no out PVC 0
in PVC down 0 out PVC down 2 pkt too big 0
shaping Q full 0 pkt above DE 0 policing drop 0
pvc create time 6d19h, last time pvc status changed 5d01h

dtlokee

So you're not using a frame relay switch between these routers?

phoeneous

Can these masks be used?

interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface Loopback1
ip address 33.3.3.3 255.255.255.255
!
interface Loopback2
ip address 44.4.4.4 255.255.255.255
!
interface Loopback3
ip address 55.5.5.5 255.255.255.255

kalebksp

phoeneous wrote: »

Can these masks be used?

interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface Loopback1
ip address 33.3.3.3 255.255.255.255
!
interface Loopback2
ip address 44.4.4.4 255.255.255.255
!
interface Loopback3
ip address 55.5.5.5 255.255.255.255

Yes, they are masks for a subnet with only a single host.

boostinbadger, you should add frame-relay maps to the spoke routers. They don't know how to contact each other because they have no DLCI to IP mapping. They're able to contact the hub router because of inverse arp.

So, on R2 add "frame-relay map ip 10.35.1.3 221 broadcast" and on R3 "frame-relay map ip 10.35.1.2 321 broadcast".

boostinbadger

I am using frame relay.

I have "no inverse arp" on all interfaces on the frame relay switch.

R1 can ping R2 and R3 through the frame switch
R2 can ping R1 but not R3 and vice versa

Here is the frame switch config:

FRS_2612#show conf
Using 1537 out of 29688 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname FRS_2612
!
boot-start-marker
boot-end-marker
!
no aaa new-model
ip cef
!
no ip domain lookup
frame-relay switching
!
interface Ethernet0/0
no ip address
shutdown
half-duplex
!
interface Serial0/0
no ip address
encapsulation frame-relay
logging event subif-link-status
logging event dlci-status-change
clock rate 56000
no frame-relay inverse-arp
frame-relay intf-type dce
frame-relay route 122 interface Serial0/1 221
frame-relay route 123 interface Serial0/2 321
!
interface TokenRing0/0
no ip address
shutdown
ring-speed 16
!
interface Serial0/1
no ip address
encapsulation frame-relay
logging event subif-link-status
logging event dlci-status-change
clock rate 56000
no frame-relay inverse-arp
frame-relay intf-type dce
frame-relay route 221 interface Serial0/0 122
!
interface Serial0/2
no ip address
encapsulation frame-relay
logging event subif-link-status
logging event dlci-status-change
clock rate 56000
no frame-relay inverse-arp
frame-relay intf-type dce
frame-relay route 321 interface Serial0/0 123
!
interface Serial0/3
no ip address
shutdown
!
ip forward-protocol nd
!
ip http server
no ip http secure-server
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
login
line aux 0
line vty 0 4
!
end

kalebksp

Inverse ARP is disabled on the routers, not the frame relay switch. A frame relay interface will send inverse ARP replies even if inverse ARP is disabled.

boostinbadger

That doesn't explain why only R2 and R3 can't communicate and R1 can ping all interfaces including loopbacks.

kalebksp

As I said in one of my previous replies, it's because R2 and R3 don't have an IP to DLCI mapping for each other.

The reason that R1 can ping everything is because inverse ARP automatically creates those mappings. When you try to ping R3 from R2, R2 looks in it's ARP cache/mappings to find R3's L2 address (DLCI, since you're using frame relay) based on it's IP. Since it doesn't have a mapping for R3's IP address the ping fails. You can use "show frame-relay mapping" to see the DLCI to IP mappings.

To correct this see my other reply which includes the appropriate frame-relay map commands.

boostinbadger

Ok. I understand what you are saying now. Forgive me for not getting it the first time. I put the two commands on r2 and r3 and it works now. Should I add the commands to r1 so that it won't strictly rely on inverse arp or does it matter?

boostinbadger

Nevermind. I see that R1 has its mappings set to dynamic (using inverse arp) and when I put in the static mappings, it now reads static.

Thanks for the help kalebksp.

phoeneous

kalebksp wrote: »

Yes, they are masks for a subnet with only a single host.

I thought /31 was. I guess I was wrong.

phoeneous

phoeneous wrote: »

I thought /31 was. I guess I was wrong.

This has helped me understand it more for using /32 for single hosts. Useful for summarization.

How /30 and /32 bit IP subnet masks can help you with Cisco Networking

boostinbadger

Somehow the config got erased from R3 so I had to reconfigure it. Now I can't ping serial interfaces between R2 and R3 again. However, I can ping R3's loopback from R2 and vice versa. I believe this works because of the ether channel link I have setup between the two switches that are hanging off each router's fa.

Here is R2's config:
R2_1760#show conf
Using 1161 out of 29688 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname R2_1760
!
boot-start-marker
boot-end-marker
!
no aaa new-model
ip cef
!
no ip domain lookup
!
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
ip address 172.23.23.2 255.255.255.224
speed auto
!
interface Serial0/0
no ip address
encapsulation frame-relay
no frame-relay inverse-arp
frame-relay lmi-type cisco
!
interface Serial0/0.123 multipoint
ip address 172.12.123.2 255.255.255.0
frame-relay map ip 172.12.123.1 221 broadcast
!
interface Serial0/1
no ip address
shutdown
!
interface Serial1/0
no ip address
shutdown
!
interface Serial1/1
no ip address
shutdown
!
router rip
version 2
network 2.0.0.0
network 172.12.0.0
network 172.23.0.0
no auto-summary
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
login
!
end

Here is R3's config:
R3_1760#show conf
Using 1126 out of 29688 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname R3_1760
!
boot-start-marker
boot-end-marker
!
no aaa new-model
ip cef
!
no ip domain lookup
!
interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet0/0
ip address 172.23.23.3 255.255.255.224
speed auto
!
interface Serial0/0
no ip address
encapsulation frame-relay
no frame-relay inverse-arp
frame-relay lmi-type cisco
!
interface Serial0/0.31 point-to-point
ip address 172.12.123.3 255.255.255.0
frame-relay interface-dlci 321
!
interface Serial0/1
ip address 172.12.13.3 255.255.255.0
!
interface Serial1/0
no ip address
shutdown
!
interface Serial1/1
no ip address
shutdown
!
router rip
version 2
network 3.0.0.0
network 172.12.0.0
network 172.23.0.0
no auto-summary
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
login
!
end

Here is a show frame route from the FRS:
2620XM_FRS#show frame-relay route
Input Intf Input Dlci Output Intf Output Dlci Status
Serial0/0 122 Serial0/1 221 active
Serial0/0 123 Serial0/2 321 active
Serial0/1 221 Serial0/0 122 active
Serial0/2 321 Serial0/0 123 active

I believe I am looking past something simple again.

kalebksp

What is R1's config? First thing that strikes me is that you have R2 configured as multipoint and R3 configured as point-to-point.

boostinbadger

mulipoint and point to point is how I am told to configure it.

Here is the config:
R1_1760#show conf
Using 1160 out of 29688 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname R1_1760
!
boot-start-marker
boot-end-marker
!
no aaa new-model
ip cef
!
no ip domain lookup
!
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
speed auto
!
interface Serial0/0
ip address 172.12.123.1 255.255.255.0
encapsulation frame-relay
frame-relay map ip 172.12.123.2 122 broadcast
frame-relay map ip 172.12.123.3 123 broadcast
no frame-relay inverse-arp
frame-relay lmi-type cisco
!
interface Serial0/1
ip address 172.12.13.1 255.255.255.0
clock rate 56000
!
interface BRI1/0
no ip address
encapsulation hdlc
shutdown
!
router rip
version 2
network 1.0.0.0
network 172.12.0.0
no auto-summary
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 172.12.123.2
!
no ip http server
no ip http secure-server
!
control-plane
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
login
!
end

gojericho0

boostinbadger wrote: »

up between the two switches that are hanging off each router's fa.

Here is R2's config:


!
interface Serial0/0
no ip address
encapsulation frame-relay
no frame-relay inverse-arp
frame-relay lmi-type cisco
!
interface Serial0/0.123 multipoint
ip address 172.12.123.2 255.255.255.0
frame-relay map ip 172.12.123.1 221 broadcast

Based on the IPs it looks like R2 and R3 are directly connected. Instead of the frame-relay map command for the serial interface try frame-relay interface dlci (local DLCI for this subint)

Someone correct me if i'm wrong, but I believe you need to use that command since the DLCIs land on the physical interface so you have to statically assign which DLCI goes on which subinterface

boostinbadger

They aren't physically directly connected.

tech-airman

boostinbadger wrote: »

They aren't physically directly connected.

boostinbadger,

What's the physical topology for your network?

boostinbadger

R1, R2, and R3 are connected through a frame relay switch.

Here is the topology minus the ISDN (for now).

Rack Rentals For CCNA Certification Prep, Cisco CCNP Exam

tech-airman

boostinbadger wrote: »

R1, R2, and R3 are connected through a frame relay switch.

Here is the topology minus the ISDN (for now).

Rack Rentals For CCNA Certification Prep, Cisco CCNP Exam

boostinbadger,

Questions:

1. What is your IP scheme for that given network?
2. What loopback(s) are on R1 and their assigned IP address(es) and subnet mask(s)?
3. What loopback(s) are on R2 and their assigned IP address(es) and subnet mask(s)?
4. What loopback(s) are on R3 and their assigned IP address(es) and subnet mask(s)?
5. Is the "Direct Connection via Serial Int." link being used?

boostinbadger

R1 - R3 use 172.12.123.x/24 where x is the router number

Each router has a loopback interface. ex. 1.1.1.1/32 for R1, etc

I took out the multipoint interface and stuck with point to point and put static frame maps in place again. It is now working again.

tech-airman

boostinbadger,

boostinbadger wrote: »

R1 - R3 use 172.12.123.x/24 where x is the router number

What is your design IP subnetting plan for the 172.12.123.0/24 IP network for the given network topology?

boostinbadger wrote: »

Each router has a loopback interface. ex. 1.1.1.1/32 for R1, etc

If "...each router has a loopback interface. ex. 1.1.1.1/32 for R1, etc..." then what is the purpose for the following IP addresses: 1) 33.3.3.3, 2) 44.4.4.4, 3) 55.5.5.5?

boostinbadger wrote: »

I took out the multipoint interface and stuck with point to point and put static frame maps in place again. It is now working again.