24
Network connectivity configuration
IRF is typically used with link aggregation to simplify the network topology. For high availability, set
up multichassis link aggregations with the downstream switches and the upstream egress routers,
as shown in
. The figure uses a single device to represents the four-chassis IRF fabric.
A link aggregation could span one member device, some of the member devices, or all member
devices, depending on the link redundancy requirements and number of available links. Because
this example does not use LACP MAD, the link aggregation mode can be dynamic or static. This
example uses dynamic aggregation mode for all link aggregations.
To use the IRF fabric as the gateway for servers, you must configure VLAN interfaces to provide
gateway services, as shown in
.
To use the IRF fabric in a Layer 3 network, you must configure routing. In this example, OSPF is
configured.
Figure 11 Connection diagram for the IRF fabric in a Layer 3 network
Table 7 Link aggregations and VLAN assignment scheme
Aggregate interface
Member ports
VLANs
VLAN interface's IP
address
Router A:
Bridge-Aggregation 40
Twenty-FiveGigE 1/0/1
Twenty-FiveGigE 1/0/2
Twenty-FiveGigE 1/0/3
Twenty-FiveGigE 1/0/4
VLAN 40
10.214.50.2/30
Bridge-Aggregation 42
Twenty-FiveGigE 1/0/5
Twenty-FiveGigE 1/0/6
VLAN 42
10.214.50.9/30
IRF
10.214.10.1/24
10.214.20.1/24
10.214.50.1/30
10.214.50.5/30
Device E
Device F
VLAN 10
VLAN 20
VLAN 40
VLAN 41
VLAN 42
Department A
Department B
Department C
Department D
10.214.50.2/30
10.214.50.6/30
10.214.50.9/30
10.214.50.10/30
Router A
Router B
Internet
10.214.60.1/30
10.214.70.1/30