Implementing IBM System Networking 10Gb Ethernet Switches

Chapter 3. Reference architectures 113

Trunks

We group the inter-switch connection into trunks, as shown in Table 3-5.

Table 3-5 Trunk configuration

3.2.3 Layer 3 architecture

The Layer 3 architecture describes the IP addressing used and the initial set-up for Layer 3

protocols such as Virtual Router Redundancy Protocol (VRRP) and Open Shortest Path

First (OSPF).

IP addressing

The IPv4 and IPv6 addressing that we used in the topology is presented in Table 3-6.

Table 3-6 IP addressing Top-of-Rack network

Switch Trunk Trunk members Static or LACP

ACC-1 portchannel3 port5, port6 LACP

ACC-2 portchannel3 port5, port6 LACP

ACC-1 portchannel1 port1, port2 static

ACC-1 portchannel2 port3, port4 static

ACC-2 portchannel1 port1, port2 static

ACC-2 portchannel2 port3, port4 static

AGG-1 portchannel1 port17, port18 static

AGG-1 portchannel2 port19, port20 static

AGG-1 portchannel3 port1, port5 static

AGG-2 portchannel1 port17, port18 static

AGG-2 portchannel2 port19, port20 static

AGG-2 portchannel3 port1, port5 static

VLAN IPv4 IPv6 Description

VLAN 4095 172.25.0.0/16 n/a Management

network

VLAN 10 10.0.10.0/24 FC10::0/64 VLAN10

VLAN101 10.0.101.0/30 FC11::0/64 Point-to-point link

subnet between

ACC-1 and AGG-1

VLAN102 10.0.102.0/30 FC12::0/64 Point-to-point link

subnet between

ACC-1 and AGG-2

VLAN103 10.0.103.0/30 FC13::0/64 Point-to-point link

subnet between

ACC-2 and AGG-1

114 Implementing IBM System Networking 10Gb Ethernet Switches

In Table 3-7, we show the management IPv4 addresses, that is, addresses assigned to the

management interfaces.

Table 3-7 Management IP addresses

Table 3-8 shows the IPv4 and IPv6 host addresses assignment for the devices.

Table 3-8 IPv4 and IPv6 host addresses assignment

VLAN104 10.0.104.0/30 FC14::0/64 Point-to-point link

subnet between

ACC-2 and AGG-2

VLAN100 10.0.100.0/30 FC00::0/64 Point-to-point link

subnet between

AGG-1 and AGG-2

Switch Management IP

address

Management

interface

ACC-1 172.25.101.122 port25 (MGTA)

ACC-2 172.25.101.123 port25 (MGTA)

AGG-1 172.25.101.120 port65 (MGT)

AGG-2 172.25.101.121 port65 (MGT)

VLAN IPv4 IPv6 Description

VLAN IPv4 interface IPv4 address IPv6 interface IPv6 address Device

VLAN10 Team Adapter 10.0.10.10 Team Adapter FC10::10/64 SRV-1

VLAN10 10 10.0.10.2 106 FC10::2/64

FC10::1/64

secondary

anycast

ACC-1

VLAN10 10 10.0.10.3 106 FC10::3/64

FC10::1/64

secondary

anycast

ACC-2

VLAN10 Virtual router 10 10.0.10.1 n/a n/a VRRP 10

VLAN101 101 10.0.101.1 111 FC11::1/64 ACC-1

VLAN102 102 10.0.102.1 112 FC12::1/64 ACC-1

VLAN104 104 10.0.104.2 114 FC14::2/64 ACC-2

VLAN103 103 10.0.103.2 113 FC13::2/64 ACC-2

VLAN101 101 10.0.101.2 111 FC11::2/64 AGG-1

VLAN103 103 10.0.103.1 113 FC13::1/64 AGG-1

VLAN100 100 10.0.100.1 110 FC00::1/64 AGG-1

VLAN104 104 10.0.104.1 114 FC14::1/64 AGG-2

Chapter 3. Reference architectures 115

Loopback interfaces are used for static router-ID assignment to use with OSPFv2 and

OSPFv3. Table 3-9 shows the loopback interfaces IP addresses assignment

Table 3-9 Loopback interfaces

Keep the STP bridge priorities consistent with VRRP priorities, that is, make sure that the

switch that is a root bridge for STP is also an active router for VRRP for that VLAN.

Table 3-10 shows the VRRP groups and priorities what we used in the topology.

Table 3-10 VRRP groups and priorities

OSPFv2 and OSPFv3

We run single-area Open Shortest Path First (OSPF) in area number 0 (backbone).

OSPF is run on all Layer 3 interfaces. IP interfaces of VLANs are configured with the

passive-interface option, so that the hellos are not exchanged over them.

VLAN102 102 10.0.102.2 112 FC12::2/64 AGG-2

VLAN100 100 10.0.100.2 110 FC00::2/64 AGG-2

VLAN IPv4 interface IPv4 address IPv6 interface IPv6 address Device

IP address Loopback Device

1.1.1.1/32 Loopback 1 AGG-1

1.1.1.2/32 Loopback 1 AGG-2

2.2.2.1/32 Loopback 1 ACC-1

2.2.2.2/32 Loopback 1 ACC-2

VRRP group ACC-1 priority ACC-2 priority

10 105 100 (default)