Implement Cisco L3 Switch for S11 Interface

Previous posting about example simple diagram for implement LTE Interface and Virtual Routing in core network. Here are example config on Cisco layer 3 switch (L3_Switch) for S11 interface (S11_VR).

#### Parameter

# L3_Switch

- Ethernet0/1: MME

- Ethernet0/2: SGW

# IP Address & Routing

- MME 192.168.16.2/28, gateway (default route) 192.168.16.1

- SGW 192.168.20.2/28, gateway (default route) 192.168.20.1

#### Config 

L3_Switch#

ip vrf S11_VR

 rd 65000:16

 

interface Ethernet0/1

 description S11_MME

 ip vrf forwarding S11_VR

 ip address 192.168.16.1 255.255.255.240

 duplex auto

interface Ethernet0/2

 description S11_SGW

 ip vrf forwarding S11_VR

 ip address 192.168.20.1 255.255.255.240

 duplex auto 

#### Output

L3_Switch#show ip route vrf S11_VR

Routing Table: S11_VR

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP

       + - replicated route, % - next hop override

Gateway of last resort is not set

      192.168.16.0/24 is variably subnetted, 2 subnets, 2 masks

C        192.168.16.0/28 is directly connected, Ethernet0/1

L        192.168.16.1/32 is directly connected, Ethernet0/1

      192.168.20.0/24 is variably subnetted, 2 subnets, 2 masks

C        192.168.20.0/28 is directly connected, Ethernet0/2

L        192.168.20.1/32 is directly connected, Ethernet0/2

MME>

traceroute 192.168.20.2 

1 192.168.16.1

2 192.168.20.2

  

SGW>

traceroute 192.168.16.2

1 192.168.20.1

2 192.168.16.2