7.5.3 Switching communication between member switch
You can configure the stack to switch communications quickly in the event of a member switch failure or recovery. If you need to switch communications in a short period of time, configure link aggregation across multiple member switches to connect to other devices, and then use a function that supports short-time communication switching on the stack. The following table describes the support status of short-time communication switching in the stack by using functionality.
|
Category |
Functionality |
Supported |
|---|---|---|
|
Network Interfaces |
Ethernet |
OK |
|
Link Aggregation |
Static |
OK |
|
LACP #1 |
OK |
|
|
Standby Link Down Mode |
NG |
|
|
Standby Link Non-Linked Down Mode |
OK |
|
|
Layer 2 forwarding |
MAC Address Learning |
OK |
|
Port VLAN |
OK |
|
|
Protocol VLAN |
OK |
|
|
Tag translation |
OK |
|
|
VLAN tunneling |
OK |
|
|
Spanning Tree Protocols |
NG #2 |
|
|
Ring Protocol #3 |
OK |
|
|
IGMP snooping |
OK |
|
|
Filters and QoS |
Filters |
OK |
|
QoS |
OK |
|
|
High Reliability Based on Redundant Configurations |
Uplink redundant*3 |
OK |
|
Network monitoring function |
L2 Loop Detection |
OK |
|
Network management |
IEEE 802.3ah/UDLD |
OK |
|
IPv4 packet-forwarding*4 |
IPv4 .ARP |
OK |
|
Policy-based Routing |
OK |
|
|
DHCP Relay |
OK |
|
|
IPv4 unicast routing protocol |
Static routing |
OK |
|
RIP |
NG |
|
|
OSPF |
OK #5 |
|
|
BGP4 |
OK #5 |
|
|
IPv4 Multicast Routing Protocols |
PIM-SM |
OK #6 |
|
PIM-SSM |
OK #6 |
|
|
IPv6 packet-forwarding*4 |
IPv6 .NDP |
OK |
|
IPv6 DHCP relay |
OK |
|
|
IPv6 unicast routing protocol |
Static routing |
OK |
|
RIPng |
NG |
|
|
OSPFv3 |
OK #5 |
|
|
BGP4+ |
OK #5 |
Legend OK: Supported; NG: Not supported
- Note #1
-
If the following conditions are satisfied, communication can continue without downgrading LACP channel group when the master switch is switched. However, when the master switch is switched, LACPDU is not sent until LACPDU is received from the partner switch even if LACP startup mode of the Switch is active. Therefore, if the partner switch also supports LACP short-time communication switching, if the master switch is switched between the Switch and the partner switch at the same time, both switches enter LACPDU receive wait status and the channel group goes down due to a timeout.
The port-detachment limiting functionality does not operate until LACPDU is received from the partner switch.
|
Item |
Switch |
Facing device |
|---|---|---|
|
Configuring Link Aggregation across Multiple Member Switches |
Required |
Optional |
|
LACPDU Transmit Interval |
long |
long |
- Note #2
-
Repeat the topology calculation from the beginning when switching the master switch. Communication of VLAN running Spanning Tree is stopped until the topology calculation is completed.
- Note #3
-
You can switch communication for a short period of time without having to configure link aggregation across multiple member switches.
- Note #4
-
IPv4/IPv6 packetsSoftware forwarding and IPv4/IPv6 communication to the Switch do not support short-time communication switching.
- Note #5
-
When graceful restart is used.
- Note #6
-
This is when the configuration command ip pim nonstop-forwarding is set.
The communication switching time includes the link down detection time of the line connected to the stack and the link up detection time.