Hello,
I am currently configuring a cisco switch 3560 layer 3 connected to another router to be able to reach a new network.
currently my switch is connected to another router with this interface :
interface GigabitEthernet1/2
description to PE_N
switchport access vlan 1016
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1016
switchport mode trunk
OSPF is enabled and I can reach all networks bellow is the current configuration to reach the other networks:
(Server in VLAN SIG testbed can reach network 10.29.105.0/28)
(Servers in VLAN OAM can reach a network)
...
vlan 35
name VLAN_OAM
!
vlan 178
name VLAN SIG testbed
!
vlan 1016
name Sig_PE3
!
.....
interface GigabitEthernet0/5
switchport access vlan 35
switchport mode access
!
interface GigabitEthernet0/6
switchport access vlan 35
switchport mode access
!
interface GigabitEthernet0/7
switchport access vlan 35
switchport mode access
!
interface GigabitEthernet0/8
switchport access vlan 35
switchport mode access
....
interface GigabitEthernet0/17
description to server1_ETH5
switchport access vlan 178
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/18
description to server2_ETH5
switchport access vlan 178
switchport mode access
spanning-tree portfast
....
interface Vlan35
ip address 192.168.35.45 255.255.255.240
!
interface Vlan178
description VLAN_SIG_testbed
ip address 10.15.104.1 255.255.255.240
!
interface Vlan1016
description MPLS_Maquette
ip address 10.96.96.2 255.255.255.252
!
interface Vlan178
description VLAN_SIG_testbed
ip address 10.15.104.1 255.255.255.240
!
router ospf 12
network 10.15.104.0 0.0.0.15 area 0
network 10.96.96.0 0.0.0.3 area 0
network 192.168.35.32 0.0.0.15 area 0
I have to add another network (10.29.153.64/28 and 10.30.153.64/28) to be reachable from 192.168.35.16/28 and I am not sure if it can be added in this way by defining a new ospf id instance as if I am adding it in the instance id 12 a loop happen between my 3560 L3 switch and the adjacent router:
the first try I did was like bellow where I created a new VLAN 1017 and then I added the VLAN 1017 into the interface Gi1/2:
!
vlan 1017
name Diameter_PE3
!
....
!
interface GigabitEthernet0/12
switchport access vlan 188
switchport mode access
switchport mode access
spanning-tree portfast
!
....
!
interface GigabitEthernet1/2
description to PE3_NE40
switchport access vlan 1016
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1016,1017
switchport mode trunk
!
interface Vlan188
description VLAN_DMTR_mqt
ip address 192.168.35.19 255.255.255.240
!
interface Vlan1017
description MPLS__mqt
ip address 10.96.96.6 255.255.255.252
!
router ospf 12
network 10.15.104.0 0.0.0.15 area 0
network 10.96.96.0 0.0.0.3 area 0
network 10.96.96.4 0.0.0.3 area 0
network 192.168.35.16 0.0.0.15 area 0
network 192.168.35.32 0.0.0.15 area 0
===> then the opposite side was still not able to reach my server inside the network 192.168.35.16/28.
Now I am looking to create a new instance id so it will be like this :
router ospf 12
network 10.15.104.0 0.0.0.15 area 0
network 10.96.96.0 0.0.0.3 area 0
network 192.168.35.32 0.0.0.15 area 0
router ospf 13
network 10.96.96.4 0.0.0.3 area 0
network 192.168.35.16 0.0.0.15 area 0
Is it possible ? or should I have to create a virtual interface in Gi1/2 like
Gi1/2.1016
and
Gi1/2.1017
In order to reach both network ?
If I look after route it seems that everything is going through 10.96.96.1 instead of 10.96.96.5.
output from sh ip route cde:
SW_TB#sh ip route
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 10.96.96.1 to network 0.0.0.0
C 10.15.104.0/28 is directly connected, Vlan178
L 10.15.104.1/32 is directly connected, Vlan178
C 10.96.96.0/30 is directly connected, Vlan1016
L 10.96.96.2/32 is directly connected, Vlan1016
C 10.96.96.4/30 is directly connected, Vlan1017
L 10.96.96.6/32 is directly connected, Vlan1017
O 10.29.153.64/28 [110/42] via 10.96.96.1, 01:13:54, Vlan1016
O 10.30.153.64/28 [110/42] via 10.96.96.1, 01:13:55, Vlan1016
O 10.29.105.0/24 [110/107] via 10.96.96.1, 01:13:54, Vlan1016
C 192.168.35.16/28 is directly connected, Vlan188
L 192.168.35.19/32 is directly connected, Vlan188
C 192.168.35.32/28 is directly connected, Vlan35
L 192.168.35.45/32 is directly connected, Vlan35
Many thanks for your answers.
