Minh,
Certainly you can use "ip unnumbered" and it will save IP addresses. But you
will NOT be
able to ping the serial interface that uses "ip unnumbered". If you don't
believe me
please read the CCO reference (scroll up a bit).
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcprt1/1cfipadr.htm#1001113
I will quote it to you:
"You cannot use the ping EXEC command to determine whether the interface is
up, because
the interface has no IP address. The Simple Network Management Protocol
(SNMP) can be
used to remotely monitor interface status."
As the excerpt suggests, pinging is only one of many ways to check if the
connection is
working.
-Jonathan
Minh Vu wrote:
> You should able to ping the interface that used "ip unnumbered" cuz it use
> Ethernet 0 IP address.
> I tried to ping my PC to RO router. I should able to ping RO ip cuz my RO
> Ethernet0 is xxx.xxx.96.65. The reason I used "ip unnumbered" to save my
ip
> address and that usually for DDR. Let see, there are 16 Async interfaces
> and 16 dialer interfaces then I will loose 32 IPs just for that?
>
> > If pinging is needed why not assign IP addresses to the two ends of a the
> serial link?
> > As long as you do not plan to advertise the serial interface IP addresses
> via some
> > routing protocol (RIP, OSPF, etc.) you could assign 192.168.1.1
> 255.255.255.252 to CS
> > and 192.168.1.2 255.255.255.252 to RO and ping away. Since this is a hub
> and spoke
> > topology, use static routes if necessary.
> > ---
> > Jonathan Hays
> >
> > Minh Vu wrote:
> >
> > > hello all
> > >
> > > I tried to solve problem from my office (to save a trip). I got the
> Dialer
> > > up/up and Async up/up at CS site but I couldn't ping from CS to remote
> > > office.
> > >
> > > CS------RO (CS = Access Server 2511, RO = Remote office 2509)
> > >
> > > show interface on Dialer1 @ CS, it display :
> > > Dialer1 is up (spoofing), line protocol is up (spoofing)
> > >
> > > show int as1 @CS
> > > Async1 is up (spoofing), line protocol is up (spoofing)
> > > LCP open
> > > Close: CDPCP
> > > Open: IPCP
> > >
> > > Look at the CDPCP it still Close, what is that for? how can I get it
> Open.
> > >
> > > Any hint?
> > >
> > > here is config in CS
> > > interface Ethernet0
> > > ip address xxx.xxx.95.2 255.255.255.255.192
> > >
> > > interface Async1
> > > ip unnumbered Ethernet 0
> > > encapsulation ppp
> > > async mode dedicated
> > > peer default ip address xxx.xxx.96.65
> > > dialer in-band
> > > dialer rotary-group 1
> > > dialer-group 1
> > >
> > > interface Dialer1
> > > ip unnumbered Ethernet 0
> > > encapsulation ppp
> > > dialer in-band
> > > dialer idle-timeout 3600
> > > dialer map ip xxx.xxx.96.65 modem-script dial 7777777
> > > dialer-group 1
> > >
> > > access-list 101 permit ip any any
> > > dialer-list 1 protocol ip list 101
> > > passive-interface Dialer1
> > >
> > > ip route xxx.xxx.96.64 255.255.255.240 xxx.xxx.96.65
> > > ip route xxx.xxx.96.65 255.255.255.255 Dialer1
> > >
> > > ===============
> > > here is config at RO site
> > >
> > > interface Ethernet0
> > > ip address xxx.xxx.96.65 255.255.255.240
> > >
> > > interface Async1
> > > ip unnumbered Ethernet0
> > > encapsulation ppp
> > > async mode dedicated
> > > peer default ip address xxx.xxx.95.2
> > > dialer in-band
> > > dialer rotary-group 1
> > > dialer-group 1
> > >
> > > interface Dialer1
> > > ip unnumbered Ethernet0
> > > encapsulation ppp
> > > dialer in-band
> > > dialer idle-timeout 3600
> > > dialer map ip xxx.xxx.95.2 modem-script dialer 8888888
> > > dialer-group 1
> > >
> > > ip route xxx.xxx.0.0 255.255.0.0 164.226.95.2
> > > ip route xxx.xxx.95.2 255.255.255.255 Dialer1
> > >
> > > access-list 101 permit ip any any
> > > dialer-list 1 protocol ip list 101
> > >
> > > ==========
> > > Note: there are other dialer/async interface currently working in CS
> with
> > > other RO. So I think there isn't problem in CS site.
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=11753&t=11523
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