What precautions should I take when using multicast addresses on an S series switches

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Class D IP addresses are used as multicast addresses, ranging from 224.0.0.0 to 239.255.255.255. Not all class D IP addresses can be allocated randomly. Similar to unicast addresses, many reserved addresses exist. The reserved addresses are classified into the following types:
- Permanent multicast group addresses ranging from 224.0.0.0 to 224.0.0.255 are network protocol addresses allocated by IANA to the local network. When packets are sent, the TTL of the packets is 1. Therefore, the router does not forward packets from the local network segment. For example, base addresses (reserved group addresses) are multicast group addresses.
224.0.0.1: indicates all the hosts and routers joining multicast groups on a subnet.
224.0.0.2: indicates all the routers joining multicast groups on a subnet.
224.0.0.4: indicates Distance Vector Multicast Routing Protocol (DVMRP) routers.
224.0.0.13: indicates PIMv2 routers.
224.0.0.22: indicates IGMPv3 routers.
- User group addresses ranging from 224.0.1.0 to 238.255.255.255 are valid on the entire network and can be used. These addresses include the following special reserved addresses:
224.0.1.0 to 224.0.1.255: not local addresses. When packets are sent from these addresses, the TTL is greater than 1.
224.0.1.1: indicates the NTP address.
224.0.1.6: indicates the NSS address.
224.0.1.78: indicates Tibco multicast 1.
232/8: indicates the SSM group address.
233/8: indicates the GLOP group address.
- Local management group addresses ranging from 239.0.0.0 to 239.255.255.255 are valid in the local management domain only. They are private addresses and cannot be used on public networks.

Other related questions:
Precautions for configuring port isolation on S series switches
Precautions for configuring port isolation on S series switches (except the S1700) are as follows: 1. Port isolation takes effect only for interfaces on the same switch, and cannot take effect for interfaces on different switches. 2. Interfaces in a port isolation group are isolated from each other, but interfaces in different port isolation groups can communicate. If the group-id parameter is not specified, interfaces are added to port isolation group 1 by default. 3. For S series switches, the default port isolation mode is Layer 2 isolation and Layer 3 interworking. To configure Layer 2 and Layer 3 isolation, run the port-isolate mode all command in the system view.

What precautions should I take when the WLAN dual-link backup solution is deployed
When configuring dual-link backup, set the same heartbeat interval on the active and standby ACs. Additionally, the ACs cannot be used as service gateways, their service configurations must be consistent, and they must use different IP address pools.

Precautions for the configuration of multicast BFD sessions on S series switches
For S series switches, the packets sent by multicast BFD are untagged. When a BFD interface receives a tagged BFD packet, the BFD module checks whether the VLAN ID of the BFD packet is the same as the default VLAN ID on the interface. If not, the BFD module discards the packet. To configure multicast BFD on an interface, run the port default vlan command to specify the default VLAN of the interface.

What precautions should be taken when 1-to-4 optical jumpers are connected to ODFs
If 1-to-4 optical jumpers are routed to optical distribution frames (ODFs) and connected to four 10GE multimode optical fibers to transmit data over a certain distance, pay attention to the following points: - Determine the fiber connector type (LC/FC) supported by the ODF and select appropriate optical jumpers for the supported connector type. - Optical jumpers from the switches at both ends must be connected to the ODF at the same sequence. - Each pair of TX and RX optical fibers must be cross-connected on the ODF to ensure normal transmission between the optical modules at both ends. Description: ODFs rarely support MPO optical jumpers. If the two switches are not far from each other, it is recommended that they be directly connected using MPO-MPO optical fibers.

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