Hitachi GR2000 manual Protocol and Topology Restrictions, Spanning-Tree Protocol

When you use the bridge function of GR2000, pay attention to the following.

4.11.1Protocol and Topology Restrictions

4.11.1.1Spanning-Tree Protocol

When you use the spanning-tree protocol, ensure that all the bridge-connected routers and bridges are set to use the same level of the spanning-tree protocol (IEEE802.1).

The following timers used for the spanning tree in this router are set so that they operate earlier than the normal bridge router. If operation is carried out in a network in which a bridge router other than this router is combined, adjust the timer values by using the spanning tree configuration definition if any inconvenience occurs because of the relationship with the other router.

Timer type	Default value of this router	Normal default value
Max age time	18	20
Forward delay time	10	15