On S series switches, why does the Router ID of the system not take effect after it is changed through the router id command

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For S series switches that support BGP, after the system router ID is modified, you need to run the reset bgp all command to make the modification take effect on BGP. BGP then uses the router ID as the new router ID.

Other related questions:
Why cannot the router ID of the system be changed by using the router id command take effect in BGP
The changed router ID of the system can take effect in BGP only when the reset bgp all command is executed. Then, BGP takes the changed router ID as the new router ID.

IPSG does not take effect on an S series switch. What are the possible causes
If IPSG does not take effect on an S series switch (except the S1700), possible causes include the following: 1. A binding entry is incorrect. a. A static binding table is created using the user-bind static command. If the binding entry of a valid host is not in the binding table, add the host's binding entry to the binding table. If the host's entry exists in the binding table, check whether the MAC address in the entry is the same as the host's MAC address. If the network card of the host is replaced, the MAC address in the entry may not be updated. Check whether the host's entry contains VLAN information. Only when the interface connected to this host has been added to the correct VLAN, the switch allows the packets from the host to pass. b. A dynamic binding table is generated only when DHCP snooping is enabled, the interface connected to the DHCP server is configured as a trusted interface, and then the PC obtains a new IP address. 2. IPSG is not enabled in the specified interface or VLAN view. After a binding table is generated, the IPSG function must be enabled in the interface or VLAN view using the ip source check user-bind enable command. IPSG takes effect only on the interface or VLAN where it is enabled, and IPSG check is not performed on the interfaces or VLANs with IPSG disabled. Therefore, if IPSG does not take effect on an interface or in a VLAN, the IPSG function may not be enabled on this interface or in this VLAN. 3. IPSG is enabled in the VLAN to which the uplink interface belongs. IPSG is enabled on the user-side interface, namely, the downlink interface. If IPSG is enabled on the uplink interface, the packets returned by the gateway may be discarded. As a result, user service is interrupted. Solution: Disable IPSG in the VLAN to which the uplink interface belongs. 4. DHCP snooping is disabled or a DHCP snooping trusted interface is configured on the uplink interface or in the VLAN to which the uplink interface belongs. If DHCP snooping if disabled on an interface using the dhcp snooping disable command, or if a DHCP snooping trusted interface is configured on the interface using the dhcp snooping trusted command, the IPSG function on the interface or in the VLAN to which the interface belongs does not take effect. 5. Hardware ACL resources are insufficient. The hardware ACL resources are used by IPSG and other services. If the ACL resources are insufficient, IPSG cannot take effect. For example, you can run the display dhcp static user-bind all verbose command to view the IPSG status corresponding to static binding entries. If the value of IPSG Status is ineffective, IPSG of this entry does not take effect. The possible cause is that hardware ACL resources are insufficient. 6. A QoS traffic policy conflicts with IPSG. This situation may only occur in V1R6C05. When a QoS traffic policy conflicts with IPSG, the traffic behavior in the QoS traffic policy takes effect. In this situation, you need to modify service configurations.

Does an S series switch support link aggregation after stacking configuration
S series switches (except the S1700) support link aggregation after stacking configuration.

What should I do when the System Time change does not take effect
Question: Under System > System Settings > Basic Settings > System Time on the RSE6500, change the local system time, save the change, and re-log in to the RSE6500. The system time that is displayed is still the system time before the change. Possible Cause: At the time the system time change is saved, a user runs the shell command to log in to the operating system after having connected to the RSE6500 using Telnet or SSH. Solution: Ask the user to log out of the operating system by running the exit command. Then change the system time and save the change again.

Rules based on which OSPF selects router IDs of S series switches
A router ID is used to uniquely identify a device on an OSPF network. Therefore, each router ID in an OSPF process must be unique. Otherwise, an OSPF neighbor relationship cannot be established and routing information is incorrect. You are advised to configure a unique router ID for each OSPF process on an OSPF device. You can configure the router ID manually. If no router ID is specified through a command, the system selects an IP address of an interface as the router ID. The largest loopback interface IP address is used as the router ID. If no loopback interface is configured, the largest physical interface IP address is used as the router ID. The router ID is reselected in the following scenarios: The ospf xx router-id x.x.x.x command is used to reconfigure a router ID of an OSPF device. The router ID of a system is reconfigured and the OSPF process is restarted. The IP address that was selected as the router ID of a system is deleted and the OSPF process is restarted.

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