Concept Guide
!
interface Loopback4
ip address 4.4.4.2 255.255.255.0
R1#show run int port-channel 1
interface Port-channel1
switchport
ip address 192.168.20.3 255.255.255.248
R1#show run | find router
router ospf 1
router-id 172.15.1.1
passive-interface default
no passive-interface Port-channel1
network 2.2.2.0 0.0.0.255 area 0
network 3.3.3.0 0.0.0.255 area 0
network 4.4.4.0 0.0.0.255 area 0
(The above subnets correspond to loopback interfaces lo2, lo3 and lo4. These three loopback
interfaces are advertised to the VLT pair, DellEMC#1 and DellEMC#2)
network 172.15.1.0 0.0.0.255 area 0
network 192.168.20.0 0.0.0.7 area 0
CR1#show ip ospf neighbor
(R1 is a DROTHER)
Neighbor ID Pri State Dead Time Address Interface
172.16.1.2 1 FULL/BDR 00:00:31 192.168.20.2 Port-channel1
172.17.1.1 1 FULL/DR 00:00:38 192.168.20.1 Port-channel1
CR1#show ip route
(Output Truncated)
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback2
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback3
O 192.168.8.0/24 [110/2] via 192.168.20.2, 02:02:34, Port-channel1
[110/2] via 192.168.20.1, 02:02:34, Port-channel1
(OSPF-learned route back to client subnet – VLAN 800)
4.0.0.0/24 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Loopback4
O 192.168.9.0/24 [110/2] via 192.168.20.2, 02:02:34, Port-channel1
[110/2] via 192.168.20.1, 02:02:34, Port-channel1
(OSPF-learned route back to client subnet #2 – VLAN 900)
172.17.0.0/24 is subnetted, 1 subnets
O 172.17.1.1 [110/1] via 192.168.20.1, 02:02:34, Port-channel1
172.16.0.0/24 is subnetted, 1 subnets
O 172.16.1.2 [110/1] via 192.168.20.2, 02:02:34, Port-channel1
192.168.20.0/29 is subnetted, 1 subnets
C 192.168.20.0 is directly connected, Port-channel1
(OSPF peering VLAN)
10.0.0.0/24 is subnetted, 1 subnets
C 10.10.10.0 is directly connected, FastEthernet0/2
Access Switch A1 Congurations and Verication
A1 access switch is congured to not be the STP root bridge
A1#sh run | be spanning
spanning-tree mode pvst
spanning-tree vlan 1,800,900 priority 61440
interface Port-channeL2
description Port-Channel_to_Dell_VLT_Te0/4
switchport trunk encapsulation dot1q
switchport mode trunk
spanning-tree portfast trunk
Virtual Link Trunking (VLT)
1101