H3C Technologies H3C SecPath F1000-E - Manual (Page 859)

1
Collaboration Group Configuration
Overview
As shown in Figure 1 , LAN users Host A, Host B and Host C access the Internet through Device B. When
the link connecting Device A and Device B goes down, the traffic switches from Device B to the standby
device Device C because dynamic routing is enabled in the network. However, because the link
connecting Device B and the LAN is still up, the time required for dynamic route update is long and the
traffic switchover is slow, which greatly affect the LAN users’ access to the Internet.
Figure 1 Network diagram for collaboration group configuration
Internet
Device A
Device C Device B
Host A Host B Host C
GE0/0
GE0/1
After the collaboration group feature is implemented, and Device B’s ports connecting Device A and the
LAN are assigned to a collaboration group:
• When the physical state of any port in the collaboration group is down, the other ports in the
collaboration group are set to the Linkgroup-down state, which is an administratively down state. A
port in this state cannot exchange traffic with its peer.
• When the port that was physically down goes up, the system tries to bring up the other ports in the
collaboration group. If they go up in ten seconds, the collaboration group goes up; if any port fails
to go up, the port is set to the Down state, while all the other ports are set to the Linkgroup-down
state. The collaboration group is in the Down state.
In this way, dynamic routes are timely refreshed and the traffic switchover process is speeded up, which
has little impact on the LAN users’ access to the Internet.