Инструкции По Установке для 3com S7906E

 

1-16 

Enter the view of the port that 
connects to the BFD MAD 
detection link 

interface interface-type 
interface-number 

— 

Access port 

port access vlan vlan-id 

Trunk port 

port trunk permit vlan vlan-id 

Assign the 
port to the 
VLAN used 
for BFD MAD 
detection 

Hybrid port 

port hybrid vlan vlan-id 

Required 

The three approaches have 
the same effect; you can 
choose one according to the 
port type. 

By default, the port is an 
access port. 

 

If there is an intermediate device in a BFD-MAD enabled IRF, to ensure that the BFD packets can be 

transmitted among members normally, you also need to add the port that connects to the BFD MAD 

detection link on the intermediate device into the VLAN used for the detection. 

 

z 

You are not allowed to configure other services on a Layer 3 interface with BFD MAD enabled. 

z 

A VLAN interface enabled with BFD MAC detection and the interfaces of this VLAN do not support 

any Layer 2 and Layer 3 protocol applications, including ARP and LACP. 

z 

You cannot enable BFD MAD detection on VLAN interface 1. 

z 

The MAD function is mutually exclusive with VPN; therefore, Layer 3 interfaces with BFD MAD 

enabled cannot be bound with VPN. 

z 

A MAD IP address and a common IP address are not mutually interfered; they can coexist: the 

MAD IP address automatically becomes the slave address after being configured, and the common 

IP address becomes the primary address. 

z 

If an IRF configured with the BFD MAD function splits into two or more IRFs, routing collision 

information may be generated because the new IRFs still keep the forwarding entries with the 

destination being the original master device. This collision information does not affect the device 

forwarding and automatically stops to be generated with the aging of the forwarding entries. 

 

LACP MAD detection is implemented by expanding the content of an LACP packet, namely, add a TVL 

data field that is used for exchanging the active IDs of the IRF in the preserved field of the LACP packet. 

An IRF system has a unique active ID, which is represented by the member ID of the master. 

After the LACP MAD detection is enabled, a member device exchanges the active ID with other 

member devices using the LACP packets. 

z 

When the IRF operates normally, the active IDs in the LACP packets sent by all member devices 

are the same, and no multi-active collision. 

z 

When the IRF splits into two or multiple IRFs, the active IDs in the LACP packets sent by member 

devices in different IRFs are different, and the multi-active IDs are detected. 

Follow these steps to enable LACP MAD detection: