Filter
Top Products
PowerConnect B-Series FCX Configuration Guide 791
53-1002266-01
Basic IP parameters and defaults – Layer 3 Switches
26
NOTE
Layer 2 Switches support IGMP and can forward IP multicast packets. Refer to Chapter 22,
“Configuring IP Multicast Traffic Reduction for PowerConnect B-Series FCX Switches”.
IP interface redundancy protocols
You can configure a Layer 3 Switch to back up an IP interface configured on another Layer 3
Switch. If the link for the backed up interface becomes unavailable, the other Layer 3 Switch can
continue service for the interface. This feature is especially useful for providing a backup to a
network default gateway.
Layer 3 Switches support the following IP interface redundancy protocols:
• Virtual Router Redundancy Protocol (VRRP) – A standard router redundancy protocol based on
RFC 2338. You can use VRRP to configure Layer 3 Switches and third-party routers to back up
IP interfaces on other Layer 3 Switches or third-party routers.
• Virtual Router Redundancy Protocol Extended (VRRPE) – A Dell extension to standard VRRP
that adds additional features and overcomes limitations in standard VRRP. You can use VRRPE
only on Layer 3 Switches.
For configuration information, refer to the Chapter 31, “Configuring VRRP and VRRPE”.
Access Control Lists and IP access policies
Layer 3 Switches provide two mechanisms for filtering IP traffic:
• Access Control Lists (ACLs)
• IP access policies
Both methods allow you to filter packets based on Layer 3 and Layer 4 source and destination
information.
ACLs also provide great flexibility by providing the input to various other filtering mechanisms such
as route maps, which are used by BGP4.
IP access policies allow you to configure QoS based on sessions (Layer 4 traffic flows).
Only one of these filtering mechanisms can be enabled on a Dell PowerConnect device at a time.
Dell PowerConnect devices can store forwarding information for both methods of filtering in the
session table.
For configuration information, Chapter 16, “Configuring Rule-Based IP Access Control Lists (ACLs)”
Basic IP parameters and defaults – Layer 3 Switches
IP is enabled by default. The following IP-based protocols are all disabled by default:
• Routing protocols:
- Routing Information Protocol (RIP) – refer to Chapter 28, “Configuring RIP (IPv4)”
- Open Shortest Path First (OSPF) – refer to Chapter 29, “Configuring OSPF Version 2 (IPv4)”
- Border Gateway Protocol version 4 (BGP4) – refer to Chapter 30, “Configuring BGP4
(IPv4)”