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White Paper Issue: October 2006 Integration of BX600 SB9 Switches in Cisco Networks Page 32 / 47
Step 3: Verify the configuration
show link state
! Shows information about configured Link State Groups
3 Basic Multicast Services
3.1 Introduction
IP Multicast applications are common to many datacenter networks. At least the deployment software for the blade server often
uses multicast to deploy multiple servers using one data stream. In most Cisco networks, the SB9 will act as a Layer 2 switch
which has to perform IGMP snooping in order to avoid unnecessary multicast traffic at ports that are not interested in this traffic.
3.2 Recommended solution
It is advisable to enable IGMP snooping over the whole broadcast domain and therefore at all switches. To get IGMP snooping
running you will need one IGMP querier per VLAN. In most cases there will be a Layer 3 switch in each VLAN which is also the
unicast router for that VLAN.
We recommended you to configure this router for multicast routing and enable a IGMP querier in this way, because the
multicast router will need the IGMP information anyway. At the SB9 and at all other L2 switches, you only need to enable IGMP
snooping.
3.3 Configuration
The following steps are necessary to set up IGMP snooping:
• 1. Enable multicast routing and IGMP at the layer 3 switch
• 2. Enable IGMP snooping at all layer 2 switches
• 3. Verify the configuration
1. Enable multicast routing and IGMP at the layer 3 switch
! Layer 3 Switch Configuration
! ============================
!
! In this example PIM dense mode is activated since this is the
! most simple solution. In datacenter networks a more sophisticated solution
! should be used but multicast routing is not in the scope of this document.
!
ip multicast-routing distributed
!
interface Vlan1
ip address 10.222.0.1 255.0.0.0
ip pim dense-mode
!
interface Vlan10
ip address 192.168.10.1 255.255.255.0
ip pim dense-mode
!
interface Vlan20
ip address 192.168.20.1 255.255.255.0
ip pim dense-mode
2. Enable IGMP snooping at all Layer 2 switches
! Layer 2 Switch Configuration (Cisco)
!
! All these commands are enable by default and are not seen in the config normally
!
! Enable IGMP snooping global
ip igmp snooping
! Enable IGMP snooping for VLANs
ip igmp snooping vlan 1
ip igmp snooping vlan 10
ip igmp snooping vlan 20
! SB9 Switch Configuration
!
! Enable IGMP snooping global