and a child VLAN. The TrBRF is the parent, the TrCRF is the child. The TrBRF is the virtual bridge, TrCRF's belong to a given TrBRF. 3920 ports are assigned to a TrCRF. The VLAN IDs are used internally on the 3920 and are independent from the bridge or ring numbers. There is a good tuitorial on the CD or CCO under the 3920 section.
When you have two To interfaces, you can have them on the same ring or on different rings. For the same ring: Configure the TrBRF first, this is the parent vlan. Assign a bridge number (default is F) and a vlan id. Next configure a TrCRF, this is the child vlan. Assign a vlan ID, tie it to the TrBRF, and configure the ring number (in hex), and the bridging mode (SRT or SRB). Next assign ports to the TrCRF. If you assign multiple ports to the TrCRF they are on the same ring. With the single TrBRF defined you can tie multiple TrCRF's to it with different ring numbers. These will be bridged. There is no router interface configuration necessary other than ring speed to bridge between the two rings. You can give the To interfaces and the TrBRF IP addresses in the same net and ping between them. For your configuration you are not bridging on the 3920, you are bridging on the router. This is done if you are configuring DLSW, for instance. When you have configured the TrCRf for ring 2 this is the source ring used on the To interface. You can use any bridge number to the router virtual ring 100. For DLSW use the source-bridge spanning command and, of course, configure ring speed. Hope this isn't too confusing, Fred. Jerry Seven wrote: > > Hi, > > I have several Token ring switch questions: > > Router R1 has interface To0 connects to token ring network, and it's the > only device on it besides 3920, on 3920 I configured the bridge number 1 and > vlan 10 for TrBRF, ring number 2 and vlan 20 for TrCRF. > > Questions: > > 1) Why should I configure vlans for TrBRF and TrCRF, what are they for? > > 2) If I enable SRB on R1, what's the bridge number and ring number should I > choose in order to be consistent to 3920 configuration? Should I use > different bridge ID and same ring ID as follows: > > source-bridge ring-group 100 > interface To0 > source-bridge 2 2 100 > > Any help is greatly appreciated, > > J > > _________________________________________________________ > Do You Yahoo!? > Get your free @yahoo.com address at http://mail.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=24756&t=24734 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
