[c-nsp] Renumbering serial interfaces

[Smales, Robert]

Another option is to have a loopback address on the far end device with a static route on the near end device pointing at the exit interface (not the next-hop IP). That way you can telnet to the loopback address and overwrite the interface address without breaking your telnet session.

Reload in 5 as a precaution, of course.

Robert

Robert Smales                                                
Technical Engineer
Cable&Wireless Worldwide
www.cw.com                              


> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net]On Behalf Of Johan Grip
> Sent: 18 February 2010 15:21
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Renumbering serial interfaces
> 
> 
> On Thu, 18 Feb 2010 14:22:26 +0100, Steve Bertrand 
> <steve at ibctech.ca>  
> wrote:
> 
> > On 2010.02.18 03:22, Brian Turnbow wrote:
> >> Besides the reload in xx that several have mentioned you 
> can also put  
> >> secondary Ips on the link
> >> Nad then cancel the primary.
> >>
> >> I.e.
> >> interface ATM0/0.32 point-to-point
> >> Ip add 2.2.2.2 255.255.255.252 secondary
> >>
> >> Telnet/ssh to this address using source address 2.2.2.1
> >> Then no ip add 1.1.1.1 255.255.255.252
> >> The 2.2.2.2 address becomes the priamry and you should not 
> loose the  
> >> management session.
> >
> > Does this work differently on a serial interface? On an fa int:
> >
> > route-server1(config)#int lo75
> > route-server1(config-if)#ip address 208.70.109.155 255.255.255.255
> > route-server1(config-if)#ip address 208.70.109.156 
> 255.255.255.255 sec
> > route-server1(config-if)#no ip address 208.70.109.155 
> 255.255.255.255
> >
> > Must delete secondary before deleting primary
> >
> > Steve
> 
> This is how I usually do it.
> 
> ---
> Router#sh run int fa0/0
> Building configuration...
> 
> Current configuration : 136 bytes
> !
> interface FastEthernet0/0
>   ip address 2.2.2.2 255.255.255.0 secondary
>   ip address 1.1.1.1 255.255.255.0
>   duplex auto
>   speed auto
> end
> 
> Router#conf t
> Enter configuration commands, one per line.  End with CNTL/Z.
> Router(config)#int fa0/0
> Router(config-if)#ip add 2.2.2.2 255.255.255.0
> Router(config-if)#^Z
> Router#
> Router#sh run int fa0/0
> Building configuration...
> 
> Current configuration : 92 bytes
> !
> interface FastEthernet0/0
>   ip address 2.2.2.2 255.255.255.0
>   duplex auto
>   speed auto
> end
> 
> Router#
> ---
> 
> //Johan
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