Implementing IBM System Networking 10Gb Ethernet Switches

120 Implementing IBM System Networking 10Gb Ethernet Switches

VLANs

Table 3-13 shows VLANs used in the topology and the member ports of those VLANs.

Table 3-13 VLANs and port assignment

Spanning Tree Protocol

The STP mode that we use in our topology is Per-VLAN Rapid Spanning Tree Protocol

(PVRSTP). Table 3-14 shows the STP priorities for our different VLANs.

Table 3-14 STP bridge priorities

Port1:14 and port2:14 on access switches (ACC-3-1 and ACC-3-2) are configured as Fast

Forward ports.

To prevent unwanted topology changes, caused by plugging another switch into topology,

configure BPDU Guard on all ports on ACC-3-1 and ACC-3-2 switches other than those ports

used in the topology.

3.3.3 Layer 3 architecture

This section describes the IPv4 and IPv6 addressing plan and the complete Layer 3

architecture that are part of both Top-of-Rack and BladeCenter implementations.

VLAN number VLAN name Description Member ports

VLAN4095 Mgmt VLAN Management

VLAN

ACC-3, port15 (MGT1)

ACC-3-2, port15 (MGT1)

VLAN30 Server 3 VLAN VLAN for Server

farm 3

ACC-3, port 1:14 (untagged)

ACC-3, port 1:17 (tagged)

ACC-3, port 1:18 (tagged)

ACC-3-2, port 2:14 (untagged)

ACC-3-2, port 2:17 (tagged)

ACC-3-2, port 2:18 (tagged)

AGG-1, port1 (tagged)

AGG-1, port5 (tagged)

AGG-1, port21 (tagged)

AGG-1, port22 (tagged)

AGG-2, port1 (tagged)

AGG-2, port5 (tagged)

AGG-2, port21 (tagged)

AGG-2, port22 (tagged)

VLAN (STG) Priority on

ACC-3

Priority on

AGG-1

Priority on

AGG-2

30 (30) Default (61470) 0 4096

Chapter 3. Reference architectures 121

IPv4 and IPv6 addressing

Table 3-15 shows the IPv4 and IPv6 address spaces assigned for VLAN 30.

Table 3-15 IP address ranges

Table 3-16 shows the IP addresses assigned to devices that have IP interfaces in VLAN30

and VLAN40.

Table 3-16 IPv4 and IPv6 addresses assignment

VRRP configuration

The communications within one VLAN is done by using the access layer switches.

Inter-VLAN communications is done by using aggregation layer switches (AGG-1, AGG2)

configured with VRRP groups for different VLANs.

The VRRP priorities should be kept in-line with STP bridge priorities, that is, the STP root

bridge should be the VRRP active router. Table 3-17 shows the VRRP priorities.

Table 3-17 VRRP groups and priorities

VLAN IPv4 IPv6 Description

30 10.0.30.0/24 FC30::0/64 VLAN30

VLAN IPv4

interface

IPv4 address IPv6

interface

IPv6 address Device

VLAN30 Bonding

interface

10.0.30.30 Bonding

interface

FC30::30/64 SRV-3

VLAN30 30 10.0.30.2 36 FC30::2/64

FC30::1/64

secondary

anycast

AGG-1

VLAN30 30 10.0.30.3 36 FC30::3/64

FC30::1/64

secondary

anycast

AGG-2

VLAN30 Virtual router

30

10.0.30.1 n/a n/a VRRP 30 on

AGG-1 /

AGG-2

VRRP group AGG-1 priority AGG-2 priority

30 105 100 (default)