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are joined with the router by a single bridge.
Figure 9-7 Resulting Network Configuration (Logical)
Ring 7
Ring 5
Ring 1 Ring 3
Bridge 1
Interconnecting Catalyst Token Ring Switches Using ISL 9-9
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Tips
VTP advertisements propagate only certain configuration information. Other configuration settings must be
made on the individual switches. The configuration settings that must be made at the switch include the
following:
" Port assignments Ports cannot be assigned to TrCRFs that are not local. Therefore, if you decide to add other
ports to the TrCRFs, you must do so at the individual switch.
" IP information You cannot configure IP information for TrBRFs that are not-local. Therefore, if you decide
to change the IP configuration of any of the switches, you must make the changes at the individual switch.
" Spanning-tree parameters You cannot configure spanning-tree parameters for TrBRfs that are not-local and,
therefore, cannot configure spanning-tree parameters for TrCRFs that are not local.
Troubleshooting
If the VTP information is not being propagated to each of the switches, make sure all switches are configured to
be part of the VTP management domain called Domain A. Also, make sure that the Catalyst 5000 switches are
running VTP Version 2.
If the Catalyst 3900 does not detect the ISL module when it is inserted (i.e. it does not show up on the listing of
modules on the Module Information panel), make sure that you are running revision 3.0(1) or later of the
Catalyst 3900 software. You can verify the revision level of the software by selecting Switch Configuration on
the Configuration Menu.
If the Catalyst 3900 rejects your attempts to change the VTP mode from Transparent to Client or Server, make
sure that you have configured the ring numbers for the associated TrCRFs. The Catalyst 3900 cannot be
configured as a VTP client or server if the ring number is set to auto.
9-10 Catalyst Token Ring Switching Implementation Guide
CHAPTER 10
Configuring IP Routing between Token Ring
VLANs on the Catalyst 5000 RSM
In this chapter, you are going to configure IP routing between Token Ring VLANs on the Catalyst 5000 series
Route Switch module (RSM).
As you learned in the  Using a Switch for Ring Microsegmentation chapter, microsegmenting a network into
VLANs enables you to maximize bandwidth and performance in your network. VLANs control the size of
broadcast domains and localize traffic. However, in the past, end stations belonging to one bridged domain
(TrBRF) could not communicate with network devices in another bridged domain (TrBRF) without an additional
piece of equipment the router.
With the Catalyst 5000 series RSM, you can configure interVLAN communication between bridged domain
(TrBRFs) that are configured on multiple switches that are connected via ISL.
The Catalyst 5000 series RSM runs Cisco IOS software and provides multilayer switching and interVLAN
routing services between switched VLANs and ELANs. Utilizing the Catalyst 5000 series RSM in your network
enables you to bypass the purchase and maintenance of additional equipment in your network and to alleviate
the burden being placed on centralized routers that are currently being used for interVLAN communication in
your network.
This chapter provides the following information:
" Initial Network Configuration
" Before Beginning
" Configuration Steps
" Resulting Network Configuration
Initial Network Configuration
Currently, you have two bridged domains (TrBRFs) between which IP routing has been configured via a
centralized router. The router is a Cisco 7200 in which a 2FEISL port adapter is installed.
One bridged domain (TrBRF) is dedicated to your company s Engineering departments and is configured on a
Catalyst 5000 series switch in which a Token Ring module (WS-X5030) is installed in slot 3 and an ISL module
is installed in slot 2. There are two rings (TrCRFs) configure to support two engineering departments. Ring 30
supports the engineering department located on the first floor of your R&D building. Ports 2 and 3 of the
Token Ring module are assigned to this ring. Ring 50 supports the engineering department located on the second
floor of your R&D building. Ports 7 and 8 of the Token Ring module are assigned to Ring 50. The rings have
been joined via a logical bridge (TrBRF). The VLAN ID for the Engineering TrBRF is 100.
10-1
The second bridged domain is dedicated to your company s Marketing departments and is configured on a
Catalyst 3900 series switch in which an ISL module is installed. There are two rings (TrCRFs) configure to
support two marketing departments. Ring 20 supports the Public Relations department. Token Ring
ports 2 and 3 of the Catalyst 3900 are assigned to this ring. Ring 40 supports the Product Marketing department.
Token Ring ports 7 and 8 of the Catalyst 3900 are assigned to Ring 40. The rings have also been joined via a
logical bridge (TrBRF). The VLAN ID for the Marketing TrBRF is 200.
Both bridged domains (TrBRFs) are members of the Eng-Marketing VTP management domain. The
Catalyst 3900, Catalyst 5000, and Cisco 7200 are connected via ISL.
Figure 10-1 illustrates the initial network configuration.
Figure 10-1 Initial Network Configuration
Catalyst 3900 Cisco 7200 Catalyst 5000
TrCRF TrCRF TrCRF TrCRF TrCRF TrCRF
20 40 500 400 30 50
TrBRF 200 TrBRF 100
Because the burden of additional traffic that is being placed on the router has affected your network, you have
purchased a Catalyst 5000 series RSM and installed it in slot 5 of your Catalyst 5000 switch. Via the RSM, you
intend to configure IP routing between the Marketing and Engineering TrBRFs.
Before Beginning
Each TrBRF in a switched network requires an RSM interface and an IP address for IP routing. You have
determined these values will be as follows:
VLAN Name VLAN ID TrBRF IP Address
TrBRF 100 100 172.122.30.1 255.255.255.0
TrBRF 200 200 172.122.40.1 255.255.255.0
TrBRF 100 and TrBRF 200 are source-route bridges. Therefore, you need to create a unique TrCRF on the RSM
for each TrBRF. These TrCRFs are for the pseudo-ring on the RSM. The pseudo-ring is used to terminate RIFs.
The RSM TrCRF for TrBRF 100 will be TrCRF 400, ring 100. The RSM TrCRF for TrBRF 200 will be
TrCRF 500, ring 100.
Caution A unique TrCRF must be configure on the RSM for each TrBRF in your network. This unique TrCRF
is required for the multiring functionality on the RSM. TrCRFs cannot be shared on the RSM because the
network could be severely affected.
10-2 Catalyst Token Ring Switching Implementation Guide
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Because IP routing is currently configured between the Marketing and Engineering departments via a centralized
router, the Token Ring VLAN configuration as it exists in the switch network should be ready. However, the
following is a checklist of the switched network configuration that you use to verify that the configuration is
correct:
" The VTP management domain on the Catalyst 3900 and the Catalyst 5000 has been set to Eng-Marketing.
" The VTP mode for both switches is Server.
" VTP V2 is enabled.
" On the Catalyst 5000 the following Token Ring VLAN (TrBRF and TrCRF) configuration exists:
 TrCRF 30 is configured as ring 30, it has been associated with TrBRF 100, and it has been assigned
ports 2 and 3 of the Token Ring module located in slot 3.
 TrCRF 50 is configured as ring 50, it has also been associated with TrBRF 100, and it has been assigned
ports 7 and 8 of the Token Ring module located in slot 3.
 TrBRF 100 is configured and is associated as the parent VLAN of TrCRF 30 and TrCRF 50. [ Pobierz całość w formacie PDF ]