Setup Access-Sever

Step 1: set up base configuration

Router#enable
Router#conf t
Router(config)#hostname Access-Server
Access-Server(config)#enable Secret s
Access-Server(config)# no ip domain-lookup
Access-Server(config)#service password-encryption
Access-Server(config)#line console 0
Access-Server(config-line)#logging synchronous
Access-Server(config-line)#exec-timeout 0 0
Access-Server(config-line)#line vty 0 4
Access-Server(config-line)#logging synchronous
Access-Server(config-line)#password v
Access-Server(config-line)#transport input telnet
Access-Sever(config-line)#line 1 16
Access-Server(config-line)#exec-timeout 0 0
Access-Server(config-line)#transport input telnet
Access-Server(config-line)#end
Access-Server# wr

Setp2: set up lop0 ip address also configure the e0/0 with IP address 192.168.99.1 255.255.255.248 the reason we /29 because we don't need more than 8 host  

Access-Server#Access-Sever(config)#interface lo0
Access-Server(config-if)#ip address 192.168.99.6 255.255.255.248
Access-Server(config)#interface ethernet0
Access-Server(config-if)#ip address 192.168.99.1 255.255.255.248
Access-Server(config-if)#no shut

Run show run ip interface brief

Access-Sever#show ip int brief
Interface    IP-Address      OK? Method Status                Protocol
Ethernet0    192.168.99.1    YES manual up                    down
Loopback0    10.10.10.10     YES manual up                      up
Serial0      unassigned      YES unset  administratively down down
Serial1      unassigned      YES unset  administratively down down

Step3: configure Ip host address using the loop interface 

interface FastEthernet 0/1
 ip address 192.168.10.254 255.255.255.0
!
interface FastEthernet 0/0
 ip address 192.168.20.1 255.255.255.0
!
router ospf 1
 network 192.168.20.0 0.0.0.255 area 0
 network 192.168.10.0 0.0.0.255 area 0
 passive-interface default
 no passive-interface FastEthernet 0/0
!
end

Access-Server#conf t
Access-Server(config)#ip host R1 2001 10.10.10.10
Access-Server(config)#ip host R2 2002 10.10.10.10
Access-Server(config)#ip host R3 2003 10.10.10.10
Access-Server(config)#ip host R4 2004 10.10.10.10
Access-Server(config)#ip host SW1 2005 10.10.10.10
Access-Server(config)#ip host SW2 2006 10.10.10.10
Access-Server(config)#ip host SW3 2007 10.10.10.10
Access-Server(config)#ip host SW8 2008 10.10.10.10
Access-Server#wr

R1-R4, Sw1-Sw8 are the name of your router or Switch. 

2001-2008 they are port number look at the picture below we see 1-8 the number on yellow cap

2001  mean we connect cable 1 to connect to  R1 and so on  

Access-Sever#show line
 Tty Typ     Tx/Rx    A Modem  Roty AccO AccI   Uses   Noise  Overruns   Int
*0 CTY              -    -      -    -    -      3       0     0/0       -
1 TTY     9600/9600  -    -      -    -    -     2       2     0/0       -
2 TTY     9600/9600  -    -      -    -    -     0       0     0/0       -
3 TTY     9600/9600  -    -      -    -    -     0       1     0/0       -
4 TTY     9600/9600  -    -      -    -    -     0       0     0/0       -
5 TTY     9600/9600  -    -      -    -    -     1       1     0/0       -
6 TTY     9600/9600  -    -      -    -    -     0       0     0/0       -
7 TTY     9600/9600  -    -      -    -    -     0       0     0/0       -
8 TTY     9600/9600  -    -      -    -    -     0       1     0/0       -
9 TTY     9600/9600  -    -      -    -    -     0       0     0/0       -
10 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -
11 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -
12 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -
13 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -
14 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -
15 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -
16 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -
17 AUX   9600/9600  -    -      -    -    -      0       0     0/0       -

Check connection

Access-Sever#r1
Trying R1 (10.10.10.10, 2001)... Open

Hit  : Ctrl+Shift+6 then X to quit 

Hit : exit+enter 

Access-Server#r2

Trying R2 (10.10.10.10, 2002)... Open

Access-Server#r3

Trying R3 (10.10.10.10, 2003)... Open

Access-Server#r4

Trying R3 (10.10.10.10, 2003)... Open 

and so on