CISCO2801 routers using c2801-ipbasek9-mz.124-8a.

Router (configure) #router?
Bgp Border Gateway Protocol (BGP)
Eigrp Enhanced Interior Gateway Routing Protocol (EIGRP)
Isis ISO IS-IS
Iso-igrp IGRP for OSI networks
Mobile mobile routes
Odr On Demand stub Routes
Ospf Open Shortest Path First (OSPF)
Aripaev Routing Information Protocol (RIP)

Router (configure) #router iso-igrp 51
Protocol not in this image

C2801-advipservicesk9-mz.124-8a replaced.
Router (configure) #router iso-igrp 51
Router (config-router) #network?
Unrecognized command%
Router (config-router) #?
Router configuration commands :
Set a default command to its defaults
Define an administrative distance distance
Exit Exit from routing protocol configuration mode
Help Description of the interactive help system
Modify metric EIGRP route


Path devices before 2600, are part of the allocation, we do not know how to use this allocation?
!
!
Interface FastEthernet0/0
*.*.*.* Ip address 255.255.255.0
Duplex auto
Speed auto
!
Interface Serial0/0
*.*.*.* Ip address 255.255.0.0
!
Router igrp 51
Network *.*.*.*
Network *.*.*.*
!
Ip classless
Ip http server
Ip pim bidir-enable
!b

2801 and 2600 do not know can connect with IGRP