Advanced Feature Bandwidth Reservation

Table 1. Advanced Feature Bandwidth Reservation product support
Feature	Product	Release introduced
Advanced Feature Bandwidth Reservation Note: If your switch does not have this boot flag, it is because the hardware reserves the bandwidth automatically with no user interaction.	5320 Series	Fabric Engine 8.6 Not supported on 5320-16P-4XE or 5320-16P-4XE-DC
	5420 Series	VOSS 8.4
	5520 Series	VOSS 8.2.5
	5720 Series	Fabric Engine 8.7
	7520 Series	Fabric Engine 8.10
	7720 Series	Fabric Engine 8.10
	VSP 4900 Series	Not Supported
	VSP 7400 Series	VOSS 8.0

The switch enables this boot configuration flag by default to use advanced features on the switch. If you disable this flag and attempt to enable an advanced feature, the switch displays an error message to explain why the advanced feature failed to start, and to remind you that you must enable this boot configuration flag for that advanced feature.

Important

If you change the configuration, you must save the configuration, and then reboot the switch for the change to take effect.

If you disable this feature and save the configuration, any configuration for advanced features remains saved in the configuration file but is not used.

When you disable this feature, you can use all ports for Layer 2 or Layer 3 forwarding of standard unicast and multicast features. Use this mode if you are not configuring advanced features.

When you enable this feature, also known as Full Feature mode, the switch supports advanced features by reassigning some of the front panel ports to be loopback ports.

Advanced Features

Note

Feature support can vary by hardware. For high-level feature support information, see Fabric Engine and VOSS Feature Support Matrix.

For 5520 Series, 5720 Series, 7520 Series and 7720 Series switches, the following advanced features require loopback ports:

Application Telemetry
Fabric Extend
I-SID Mirroring
IPFIX
IS-IS Accept Policies (Inter-VRF Routing)
Multicast over SPB - UNI to NNI
Segmented Management CLIP
Simplified Virtual IST
VXLAN Gateway

For 5320 Series and 5420 Series, the following advanced features require loopback ports:

Application Telemetry
Bridged and Routed Layer 2 VSNs (C-VLAN UNIs)
E-TREE UNI
Fabric Extend
I-SID Mirroring
Inter-I-SID Routing
IPFIX
IP Shortcut Routing
IS-IS Accept Policies (Inter-VRF Routing)
Layer 3 VSNs
Multicast over SPB - NNI to UNI and UNI to NNI
Segmented Management CLIP
Simplified Virtual IST
Switched and Transparent UNI

Note

Full Feature mode does not support PIM.

Configuration Modes

Depending on the hardware, this feature supports three modes:

low
high
vim

When you select low or high, the corresponding bandwidth of the reserved Ethernet ports is allocated to the loopback required for advanced feature functionality. When you select vim, the bandwidth is allocated from the unused vim slot capacity and cannot be selected if the VIM card is present.

By default, this boot configuration flag is enabled with the following options:

Table 2. Default mode configuration
Platform	Default mode
5320 Series	low
5420 Series	low
5520 Series	vim (if vim port is available and VIM is not installed, else low level option is enabled)
5720 Series	vim (if vim port is available and VIM is not installed, else high level option is enabled
7520 Series	low
7720 Series	low

Note

For 7520 Series and 7720 Series, you can consider using low bandwidth mode instead of high bandwidth mode to free up two reserved ports for use as regular ports.

Reserved Ports

The following table shows the ports reserved as loopback ports on each platform for the supported parameters. An empty cell indicates the mode (parameter) is not supported.


Platform	Mode parameter
	low	high	vim
5320-24P-8XE 5320-24T-8XE	Reserved loopback ports: 1/25-1/27
5320-48P-8XE 5320-48T-8XE	Reserved loopback ports: 1/49-1/51
5420F-24T-4XE 5420F-8W-16P-4XE 5420F-24P-4XE 5420F-24S-4XE 5420M-24T-4YE 5420M-24W-4YE	Reserved loopback ports: Universal Ethernet ports 1/29 and 1/30 Note: To understand restrictions on using reserved loopback ports as front panel ports, see 5420 Series.
5420F-48T-4XE 5420F-16MW-32P-4XE 5420F-16W-32P-4XE 5420F-48P-4XE 5420F-48P-4XL 5420M-48T-4YE 5420M-48W-4YE 5420M-16MW-32P-4YE	Reserved loopback ports: Universal Ethernet ports 1/53 and 1/54 Note: To understand restrictions on using reserved loopback ports as front panel ports, see 5420 Series.
5520-24T 5520-24W 5520-24X	Reserved loopback ports: Universal Ethernet ports 1/25 and 1/26		Reserved internal Versatile Interface Module ports
5520-12MW-36W 5520-48SE 5520-48T 5520-48W	Reserved loopback ports: Universal Ethernet ports 1/49 and 1/50		Reserved internal Versatile Interface Module ports
5720-24MW 5720-24MXW			Reserved internal Versatile Interface Module ports
5720-48MW 5720-48MXW		Reserved loopback ports: Universal Ethernet ports 1/49 and 1/50	Reserved internal Versatile Interface Module ports
7520-48XT-6C	low and VXLAN Full Interworking Mode disabled or enabled: All front panel ports are available (default)	high and VXLAN Full Interworking Mode disabled reserves loopback port 1/54 high and VXLAN Full Interworking Mode enabled reserves loopback ports 1/53 and 1/54
7520-48Y-8C 7520-48YE-8CE	low and VXLAN Full Interworking Mode disabled or enabled reserves loopback ports 1/55 and 1/56	high and VXLAN Full Interworking Mode disabled reserves loopback ports 1/54, 1/55, and 1/56 high and VXLAN Full Interworking Mode enabled reserves loopback ports 1/53, 1/54, 1/55, and 1/56
7720-32C	low and VXLAN Full Interworking Mode disabled or enabled reserves loopback ports 1/31 and 1/32	high and VXLAN Full Interworking Mode disabled reserves loopback ports 1/30, 1/31, and 1/32 high and VXLAN Full Interworking Mode enabled reserves loopback ports 1/29, 1/30, 1/31, and 1/32

Note

To understand restrictions on using reserved loopback ports as front panel ports on the 5420 Series, see 5420 Series.

After the switch reserves the appropriate ports to become loopback ports, the ports are no longer visible in the output when you enter show interfaces gigabitEthernet.

By default, for the 5520 Series and 5720 Series switches, if you do not install a VIM in the switch, the switch uses the vim parameter. In this configuration, the VIM ports are used as loopback ports and the Universal Ethernet ports are used as regular uplink ports. When used as regular uplink ports, the port speed for the Universal Ethernet ports is 40 Gbps as a single channel port. Although the maximum supported single channel port speed is 40 Gbps, the ports can be channelized to operate as four 10 or 25 Gbps channels.

If a VIM is already installed in the 5520 Series, the switch uses the low parameter that uses Universal Ethernet ports as loopback ports and VIM ports as regular uplink ports. For the 5720 Series, the switch uses the high parameter that uses Universal Ethernet ports as loopback ports and VIM ports as regular uplink ports.

Important

You must ensure your configuration does not include reserved ports before you enable this feature. If the configuration includes reserved ports, after you enable this feature and restart the switch, the switch stops loading the configuration.