Please help me with sh ip route output, ?

Futura

See output below, I don;t get why it says: Variably Subnetted? Can you help? And it says that there are two networks connected to Serials? I only set one network up for the WAN link. 200.1 on one side and 200.11 on the other side.



Router1#

Interface IP-Address OK? Method Status
FastEthernet0/0 192.168.10.1 YES NVRAM up up
Serial0/0 192.168.200.11 YES manual up up

C 192.168.10.0/24 is directly connected, FastEthernet0/0
192.168.200.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.200.0/24 is directly connected, Serial0/0
C 192.168.200.1/32 is directly connected, Serial0/0



Router2#

Interface IP-Address OK? Method Status Prot
Serial0/0 192.168.200.1 YES NVRAM up up

192.168.200.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.200.0/24 is directly connected, Serial0/0
C 192.168.200.11/32 is directly connected, Serial0/0

Monkerz

How did you setup your interfaces?

It doesn't say there are two network connected, it says there are two routes. One route for the /24 and one route for the more specific /32.

Futura

all I did was go to each router and set each serial interface with an IP address and Subnet mask.

config t
int ser 0/0 ip address 192.168.200.11 255.255.255.0 and then
192.168.200.1 255.255.255.0 on the other one

I am trying to make a wan link with Wic 1t's and a DCE DTE Cable.

I can ping from each router to the other one fine too?

I'm lost....I don;t expect to see the /32 address in the routing table.

Monkerz

Can you post your config?

Futura

Router1#sh run
Building configuration...

Current configuration : 1161 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname Router1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
!
resource policy
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
ip subnet-zero
ip cef
!
!
!
!
no ip domain lookup
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 192.168.10.1 255.255.255.0
speed auto
!
interface Serial0/0
description Serial DCE
ip address 192.168.100.1 255.255.255.0
encapsulation ppp
no fair-queue
clock rate 64000
!
interface Serial1/0
no ip address
shutdown
!
ip classless
!
no ip http server
no ip http secure-server
!
!
control-plane
!
banner motd ^C
***********************
Cisco 1760 Router 1 DCE
***********************
^C
alias exec s sh ip int bri
!
line con 0
exec-timeout 0 0
password 7 14141B180F0B
logging synchronous
login
line aux 0
exec-timeout 0 0
password 7 00071A150754
logging synchronous
login
line vty 0 4
exec-timeout 0 0
password 7 00071A150754
logging synchronous
login
line vty 5 15
exec-timeout 0 0
password 7 070C285F4D06
logging synchronous
login
!
end

Monkerz

You sure this is the right config? Your serial interface has the wrong IP address in reference to your routing table output.

mikej412

Futura wrote: »

ip address 192.168.100.1 255.255.255.0
encapsulation ppp

You're running PPP.

If you just put an IP address on both sides of your serial link (and set the clock rate for lab back-to-back cable) and use the default HDLC encapsulation, do you see that /32 route?

Do you see that /32 route show up when you add the encapsulation ppp command to both sides of the serial link?

PPP has the feature (back from the old dial-in modem days) to add a route to the dial-in peer to the routing table. And if you don't want (or need) the peer route, there a command for that.

This topic/feature of ppp is usually covered in the books where you first learn about ppp and convert your default hdlc serial link to ppp. Depending on the book(s) you're using to study, there's probably an exercise, lab, or example that should cover it. (Of course I could be flashing back to the old CCNP BCRAN exam, but I'm sure it was explained in the CCNA too).

Futura

mikej412 wrote: »

You're running PPP.

"no peer neighbor-route" Is the command.

Amazing, I just spent a day wiping out my config and redoing everything, never thought to just try HDLC.

Quote from another site: PPP advertises its serial interface IP address to the other router, with a /32 prefix, which is a route to reach just that one host. So, both routers have a route with which to route packets to the other end of the link.

I watched the CBT Nuggets ICND 1 & 2 and read Exam Cram and no sign of this detail!!

Thanks for your help guys!! Appreciate it.,

Now I can move on to something more productive, instead of scratching my head...:D

CodeBlox

mikej412 wrote: »

You're running PPP.

If you just put an IP address on both sides of your serial link (and set the clock rate for lab back-to-back cable) and use the default HDLC encapsulation, do you see that /32 route?

Do you see that /32 route show up when you add the encapsulation ppp command to both sides of the serial link?

PPP has the feature (back from the old dial-in modem days) to add a route to the dial-in peer to the routing table. And if you don't want (or need) the peer route, there a command for that.

This topic/feature of ppp is usually covered in the books where you first learn about ppp and convert your default hdlc serial link to ppp. Depending on the book(s) you're using to study, there's probably an exercise, lab, or example that should cover it. (Of course I could be flashing back to the old CCNP BCRAN exam, but I'm sure it was explained in the CCNA too).

Odd, my professor told me it was "related to CIDR". I've been wondering about (the /32 route)

networker050184

CodeBlox wrote: »

Odd, my professor told me it was "related to CIDR". I've been wondering about (the /32 route)

Sounds like you need a better professor.

CodeBlox

He told me in these exact words when I asked about it: "it's related to CIDR, don't worry about it right now". I see now that it appears switching to PPP encapsulation on the WAN that it appears. Any clue why he would say that? Oh and for the record, MOST of my CCNA learning has been from self study at home, I feel like the class moves SOOOO slow and that we could get WAY more done. He often says "we could go back in the lab but you can do this on packet tracer". I'll admit, I have had a few questions answered just from listening in on lecture but beyond that I'd say most was learned from self study / observation.

CodeBlox

I'd hate to double post but can someone confirm that the /32 route is in no way related to CIDR? Why would my professor tell me this?

CodeBlox

Okay, found my answer here: https://supportforums.cisco.com/message/3174274

I had forgotten the ones in my routing table were denote "L" for Local. Looks like I don't need a "better" professor afterall.