Install Guide

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 Configurations and Verification
A1 access switch is configured 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
This default route is configured for testing purposes, as described in the next section. The access switch (A1) is used to
generate ICMP test PINGs to a loopback interface on CR1. This default route points to DellEMC#2’s VLAN 800 SVI interface.
It’s in place to ensure that routed test traffic has DellEMC#2’s MAC address as the destination address in the Ethernet frame’s
header
When A1 sends a packet to R1, the VLT peers act as the default gateway for each other. If the packet reaches Dell-1,
irrespective of the default gateway used, Dell-1 routes the packet to R1. Similarly, if the packet reaches Dell-2, irrespective of
the default gateway used, Dell-2 routes the packet to R1.
eVLT Configuration Example
The following example demonstrates the steps to configure enhanced VLT (eVLT) in a network.
In this example, you are configuring two domains. Domain 1 consists of Peer 1 and Peer 2; Domain 2 consists of Peer 3 and Peer
4, as shown in the following example.
In Domain 1, configure Peer 1 fist, then configure Peer 2. When that is complete, perform the same steps for the peer nodes in
Domain 2. The interface used in this example is TenGigabitEthernet.
854
Virtual Link Trunking (VLT)