Today I was busy with a configuration between a Cisco Router 871 and a Cisco Catalyst 2960. It was in an enviroment with lots of other switches ( Catalyst 3560 PoE ) So i had to create a good routing infrastructure.
Situation: Cisco Catalyst 3560 ( main infrastructure ) Cisco Catalyst 2960 ( Customer infrastructure ) Cisco Router 871 ( Customer Internet Device )
I had to create a trunk from the main infrastructure to the Customer infrastructure. This was kinda an easy part.
The main infrastructure contained a VTP domain incl. server so the Customer Infrastructure needed to be part of the main infrastructure. Since this was the easy part I created that first. second of all i had to prepare for some internet connection. I did this with the Cisco Router 871.
On the Cisco Router 871 i configured. the normal way of configuration like the other on my webblog. Except some configurations below i had to add to my Cisco Router 871.
vlan 2
name <voice-lan>
!
vlan 181
name <customer-name>
interface FastEthernet0
switchport mode trunk
!
interface FastEthernet1
switchport access vlan 181
!
interface FastEthernet2
switchport access vlan 181
!
interface FastEthernet3
switchport access vlan 181
switchport voice vlan 2
A static rout to the Cisco Catalyst 2960
ip route < network > < subnet > < switch ip address >
Added VLAN interfaces on the Cisco Router 871
interface Vlan1
description LAN < your line >
ip address < native network id > 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat inside
ip virtual-reassembly
ip route-cache same-interface
ip route-cache policy
ip route-cache flow
ip policy route-map RMP_Vlan1_NO_NAT
!
interface Vlan181
description LAN < your own text >
ip address < Customer network id> 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat inside
ip virtual-reassembly
ip route-cache policy
ip route-cache flow
ip policy route-map RMP_Vlan1_NO_NAT
!
interface Vlan2
description LAN < your own text >
ip address < Voice Lan ID > 255.255.254.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat inside
ip virtual-reassembly
ip route-cache same-interface
ip route-cache policy
ip route-cache flow
ip policy route-map RMP_Vlan1_NO_NAT
On the Switch side it wasn’t that special. Just one interface for trunking.
interface GigabitEthernet0/2
switchport mode trunk
switchport nonegotiate
ip default-gateway < ip address route r>
make for sure a notice: use a cross-cable otherwise both ports on switch as router have the status DOWN.