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cisco 1721

sanzee-buddy
Level 1
Level 1

Hi All,

here ismy query ..,

in our company we 've 1 cisco 1721 router. It has only 1 serial interface. Now campany has asked me to integrate it for another line. It has one slot for upgradation. Is it possible to utilise installing another serial interface and make the config such that it it routes to both the serial interface simultaniously .. i'm not a cisco expert . Asking help from guies out there ...

here is the sh run :--

Router>en

Password:

Router#sh run

Building configuration...

Current configuration : 1956 bytes

!

version 12.2

service timestamps debug uptime

service timestamps log uptime

service password-encryption

!

hostname Router

!

enable secret Y YYYYYYYYYY

!

ip subnet-zero

ip name-server 202.54.9.1

ip name-server 202.54.1.30

!

!

!

!

interface FastEthernet0

ip address 192.168.100.254 255.255.255.0

ip nat inside

speed auto

full-duplex

!

interface Serial0

ip address fff.ee.dd.29 kkk.kkk.kkk.252

ip access-group 101 in

ip accounting output-packets

ip nat outside

!

interface Serial1

ip unnumbered FastEthernet0

!

ip nat pool search aaa.bbb.ccc.33 aaa.bbb.ccc.60 netmask kkk.kkk.kkk.224

ip nat inside source list 1 pool search overload

ip classless

ip route 0.0.0.0 0.0.0.0 Serial0

ip route 0.0.0.0 0.0.0.0 fff.ee.dd.30

ip route 0.0.0.0 0.0.0.0 aaa.bbb.ccc.60 50

ip route aaa.bbb.ccc.128 255.255.255.128 Null0

no ip http server

!

!

access-list 1 permit 192.168.100.0 0.0.0.255

!

line con 0

exec-timeout 0 0

password X XXXXXXXXXX

login

line aux 0

line vty 0 4

password X XXXXXXXXXX

login

!

no scheduler allocate

end

-----------

If that is possible pls givethe logic how to implement this ..

Thank you ..

regards..

sanzee

2 Replies 2

konigl
Level 7
Level 7

Sanzee, I think "multilink PPP" is what you're looking for. Here's a couple of links:

Sample Configuration - Inverse MUX Application using Multilink PPP

http://www.cisco.com/en/US/tech/tk713/tk507/technologies_configuration_example09186a0080093d69.shtml

Multilink PPP on Back-to-Back Routers with Multiple Serial Interfaces

http://www.cisco.com/en/US/tech/tk713/tk507/technologies_configuration_example09186a00800a3b85.shtml

Hope this helps.

Thank you Konigl ,

But they are not much suitable for the simple one 1721 router. Best with 4500series or so . and in my case i 've controle on only my end of router. So configuring with this is not a practical one here as any of our isp s won't do any favour of configuring their router in sync with ours.

I was thinking weather we can user route-map insted and try routing as per source ip address, since i 'd be basically getting two sets of ip pool etc and two serial port to route for. i tryed with this :--

Router#sh run

Building configuration...

Current configuration : 1521 bytes

!

version 12.2

service timestamps debug uptime

service timestamps log uptime

service password-encryption

!

hostname Router

!

enable secret Y YYYYY

!

ip subnet-zero

ip name-server 202.54.9.1

ip name-server 202.54.1.30

!

!

!

!

interface FastEthernet0

ip address 192.168.100.254 255.255.255.0

ip address mmm.nnn.o.210 kkk.kkk.kkk.240 secondary

ip nat inside

speed auto

full-duplex

!

interface Serial0

ip address fff.ee.dd.29 kkk.kkk.kkk.252

ip accounting output-packets

ip nat outside

!

interface Serial1

ip unnumbered FastEthernet0

!

ip nat pool search aaa.bbb.ccc.33 aaa.bbb.ccc.60 netmask kkk.kkk.kkk.224

ip nat inside source list 1 pool search overload

ip classless

ip route 0.0.0.0 0.0.0.0 Serial0

ip route 0.0.0.0 0.0.0.0 Serial1

no ip http server

!

!

access-list 1 permit 192.168.100.0 0.0.0.255

access-list 102 permit ip aaa.bbb.ccc.32 0.0.0.31 any

access-list 103 permit ip mmm.nnn.o.208 0.0.0.15 any

route-map abc permit 10

match ip address 103

set ip next-hop ii.j.kkk.32

!

route-map abc permit 20

match ip address 102

set ip next-hop qqq.rr.ss.30

!

!

line con 0

exec-timeout 0 0

password X XXXXX

login

line aux 0

line vty 0 4

password X XXXXX

login

!

-------------

mmm.nnn.o.210 kkk.kkk.kkk.240-->S1 global IP

fff.ee.dd.29 kkk.kkk.kkk.252-->S0 global IP

aaa.bbb.ccc.33 aaa.bbb.ccc.60 netmask kkk.kkk.kkk.224----> ISP-1 ip pool

ip mmm.nnn.o.208 0.0.0.15-->ISp-2 ip pool windcard(mmm.nnn.o.208-mmm.nnn.o.223/24)ippool

ii.j.kkk.32-->ISP-2 router's ip

qqq.rr.ss.30-->ISP-1 router's ip

Since our ISP-2 prerequisie is to use ip unnumbered i just had to do this.I tried con make a secondary ipconfigured. make a separate subnet. route that traffic from saperately via root-map.

But this and its variant configuration whatever i did i found that either all the trafic is routing from S0 or no traffic is routing at all.

Do i 've to create equal metric distance for each route-map name.??

do guide is this going to work ..

sanzee