SNR S2989G-48TX-DC — настройка и устранение неполадок VLAN и MAC-таблицы [154/553]

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S2989G-24TX Operation Manual Chapter 2 Layer 2 services

Configuration

switch(config-if-vlan2)#exit

2.20.4

Super VLAN Troubleshooting

 Supervlan and these functions (VRRP, dynamic VLAN, private VLAN, multicast VLAN,

etc.) are mutually exclusive, so they should not be used at the same time.

 arp-proxy of subvlan takes effect to only one subvlan. Flow received by VLAN with

arp-proxy can be forwarded to other VLAN. When two devices send flows to each

other at different subvlan, please enable arp-proxy function on two subvlans.

 Sub vlan can not set layer-3 interface.

 When creating/deleting supervlan, VLAN needs to ensure no layer-3 interface, if not,

it will result in error.

 If interface of supervlan specifies IP address range, but do not specify address range

of subvlan, address range set by interface is standard. If both interface and subvlan

specify IP address range, please check whether packets are within subvlan address

range firstly, second, check whether packets are within interface address range. After

that, packets can be processed other operations.

 When setting supervlan or subvlan, VLAN must be existed, it can be set.

 When port mode is set as trunk, it will automatically filter supervlan from allow-vlan.

2.21

MAC Table

2.21.1

Introduction to MAC Table

MAC table is a table identifies the mapping relationship between destination MAC

addresses and switch ports. MAC addresses can be categorized as static MAC addresses

and dynamic MAC addresses. Static MAC addresses are manually configured by the user,

have the highest priority and are permanently effective (will not be overwritten by dynamic

MAC addresses); dynamic MAC addresses are entries learnt by the switch in data frame

forwarding, and is effective for a limited period. When the switch receives a data frame to

be forwarded, it stores the source MAC address of the data frame and creates a mapping

to the destination port. Then the MAC table is queried for the destination MAC address, if

hit, the data frame is forwarded in the associated port, otherwise, the switch forwards the

data frame to its broadcast domain. If a dynamic MAC address is not learnt from the data

frames to be forwarded for a long time, the entry will be deleted from the switch MAC

table.

There are two MAC table operations: