routing between 887W and 2851 routers

[lukaszdobrzanski]

Hello,

I am struggling to figure out my options for a routing between 887W-GN-A-K9 and 2851 routers.

887 Router is packed with 1 x ADSL2+, 4 x Fast Ethernet (Layer 2), 1 x ISDN BRI interfaces (no possibility for HWIC or WIC cards)

2851 Router is packed with 2 x Giga Ethernet (Layer 3), 1 x ISDN BRI , 1 x WIC-1T (possibility for HWIC, WIC ... cards)

​Is there any way to connect routers and implement EIGRP routing ?

I will be glad for any help.

Kind regards

Lukas 

[Karsten Iwen]

Is it for learning? Then just connect one of the 2851-Gig-interfaces to one of the switchports of the 887. The Gig-interface will automatically switch down to a speed of 100 MBit/s.

[lukaszdobrzanski]

Hi Karsten,

I did this however i couldn't get it work.

2851 Gig interface can operates at Layer 3:

• interface Gig0/0
• ip address 172.16.1.1 255.255.255.0
•  
• router eigrp 1
• network 172.0.0.0

887 fastEthernet interface can operates at Layer 2:

• intervace vlan 172
• ip address 172.16.2.1 255.255.255.0
•  
• interface fastEthernet1
• switchport mode access
• switchport access vlan 172
•  
• router eigrp 1
• network 172.0.0.0

I couldn't ping both IP addresses and also after: show ip router command i couldn't find any eigrp routs.

[Karsten Iwen]

If you connect both routers directly, both interfaces have to share a common subnet. Configure the interface vlan 172 to an ip address of 172.16.1.2/24.

To practice your routing, configure Loopback-interfaces on both routers.

For example on the 2851:

interface Loopback 0
 ip address 172.16.11.1 255.255.255.255

And on the 887:

interface Loopback 0
 ip address 172.16.12.1 255.255.255.255

[lukaszdobrzanski]

will try after work.

Thanks Karsten

[jhager001]

This configuration should work, I'll build a lab tomorrow to test using a 800 series rtr and a 2900 rtr.