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Chapter 18      Managing Carrier Ethernet Configurations
  Viewing Spanning Tree Protocol Properties
Step 4To view the properties of an STP instance, do one of the following:
Double-click the required instance.
Click the required entry in logical inventory under the Spanning Tree Protocol branch.
Table 18-4 describes the information that is displayed in the STP Instance Information Properties 
window. STP Root Port Hyperlinked entry to the STP port in logical or physical inventory. 
Root Cost Root cost value for this bridge.
Designated Root MAC address of the designated root.
Bridge ID Bridge identifier (MAC address).
Bridge Hello Time Hello message keepalive interval (in seconds) when the port is the root.
Hello Time Current hello time (in seconds).
Bridge Forward Delay When the port is the root and in the listening or learning state, amount 
of time to wait (in seconds) before proceeding to the forwarding state.
Forward Delay Current bridge forward delay (in seconds).
Bridge Max Age When the port is the root, maximum age of learned Spanning Tree 
Protocol port information (in seconds).
Max Age Current maximum age (in seconds).
Table 18-3 STP Properties (continued)
Field Description
Table 18-4 STP Instance Information Properties
Field Description
STP Instance ID STP instance identifier.
VLAN ID VLAN identifier.
Bridge Priority Bridge priority.
Bridge ID Bridge identifier (MAC address).
Root Cost Root cost value for this bridge.
Designated Root MAC address of the designated root.
Bridge Hello Time Hello message keepalive interval (in seconds) when the port is the root.
Hello Time Current hello time (in seconds).
Bridge Forward Delay When the port is the root and in listening or learning state, amount of 
time to wait (in seconds) before proceeding to the forwarding state.
Forward Delay Current bridge forward delay (in seconds).
Bridge Max Age When the port is the root, the maximum age of learned Spanning Tree 
Protocol port information (in seconds).
Max Age Current maximum age (in seconds).
STP Protocol Specification Specific STP protocol type or variant used for this instance, such as 
Rapid PvSTP.
Is Root Whether or not the port is the root: True or False. 
						

							  
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Chapter 18      Managing Carrier Ethernet Configurations
  Viewing Spanning Tree Protocol Properties
Step 5To view MSTP properties, choose the required MSTP entry in logical inventory under Spanning Tree 
Protocol. 
Table 18-5 describes the information that is displayed for MSTP.
Ports Info Table
STP Port Hyperlinked entry to the STP port in physical inventory. 
Port  State STP port state: Disabled, Blocking, Listening, Learning, or Forwarding, 
Port Role Port role: Unknown, Backup, Alternative, Designated, Root, or 
Boundary. 
Port  Priority Default 802.1p priority assigned to untagged packets arriving at the port.
Port Path Cost Port path cost, which represents the media speed for this port.
Point To Point Port Whether or not the port is linked to a point-to-point link: True or False.
Edge Port Whether or not the port is an edge port; that is, whether it is connected 
to a nonbridging device: True or False. 
MST Port Hello Time This field is displayed in the Ports Info Table only for MST. 
In seconds, the interval between hello BPDUs sent by root switch 
configuration messages. The range is 1 to 10 seconds. 
Port Identifier STP port identifier.
Portfast Whether or not STP PortFast is enabled on the port: Up or Down.
Designated Port Identifier Designated STP port identifier.
Designated Bridge STP designated bridge.
BPDU Filter BPDU Filter status: Up or Down.
BPDU Guard BPDU Guard status: Up or Down.
Table 18-4 STP Instance Information Properties (continued)
Field Description
Table 18-5 MSTP Properties in Logical Inventory
Field Description
MST Force Version Force version used: MST, PVSTP, RSTP, STP, or Unknown.
MST  Cfg  ID  Rev  Level Revision level used by the selected device and negotiated with other 
devices.
MST Cfg ID Name MSTP instance name.
MST Max Instances Maximum number of MSTP instances.
MST Cfg ID Fmt Sel Configuration format used by this device and negotiated with other 
devices.
MST External Root Cost External root cost of the MSTP instance. 
						

							  
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Chapter 18      Managing Carrier Ethernet Configurations
  Viewing Resilient Ethernet Protocol Properties (REP)
The following topics describe how to view STP properties related to: 
VLAN domain views and overlays—See Viewing STP Information in VLAN Domain Views and 
VLAN Overlays, page 18-83.
VLAN service link properties—See Viewing STP Properties for VLAN Service Links, page 18-84.
Viewing Resilient Ethernet Protocol Properties (REP)
Cisco Resilient Ethernet Protocol (REP) technology is implemented on Cisco Carrier Ethernet switches 
and intelligent service edge routers. REP is a segment protocol, and a REP segment is a chain of ports 
connected to each other and configured with the same segment identifier. Each end of a segment 
terminates on an edge switch. The port where the segment terminates is called the edge port. 
Prime Network discovers and displays REP Segments (identified by a REP segment identifier that is 
locally configured on the network element) along with Global REP configuration details.
You can also view the REP port roles (open, alternate, and failed) in the Vision client map. The REP port 
role is displayed as a tool-tip between the REP enabled trunk ports in the Ethernet links. Using the Vision 
client, you can identify if the segment is open or closed.
The map displays the forwarding direction (REP port roles) along the Physical links within VLAN 
overlays. It also displays the forwarding direction along the VLAN links among the switching elements 
within the VLAN logical domain topology.
REP implementation supports the following faults:
A REP Port Role change to Failed service event will be generated when a REP port role is change 
from Alternate or Open to Failed.
A REP Port Role change to OK clearing service event will be generated when a REP port role is 
change from Failed to Alternate or Open. 
Correlation to these service events to physical layer events (for example Link down or Port down) is also 
performed. 
You can view REP properties in logical inventory. 
Step 1In the Vision client, double-click the device configured for REP. 
Step 2In the Inventory window, choose Logical Inventory > Resilient Ethernet Protocol. 
Figure 18-4 shows an example of REP in logical inventory.  
						

							  
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Chapter 18      Managing Carrier Ethernet Configurations
  Viewing Resilient Ethernet Protocol Properties (REP)
Figure 18-4 REP in Logical Inventory 
Table 18-6 describes the information that is displayed for REP. 
Step 3To view REP segment properties, double-click the required entry in the REP Segments table. 
Figure 18-5 shows an example of REP segment properties in logical inventory.
Table 18-6 REP Properties
Field Description
Process Process name; in this case, Resilient Ethernet Protocol.
Process Status State of the REP process, such as Running or Down.
Administrative VLAN Administrative VLAN used by REP to transmit its hardware flooding 
layer messages. Values range from 1 to 4094. 
Notification Enabled Whether or not notification is enabled: True or False.
REP Version Version of REP being used.
REP Segments Table
Segment ID Segment identifier. 
Segment Complete Whether the segment is complete; that is, that no port in the segment is 
in a failed state: True or False. 
						

							  
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  Viewing Resilient Ethernet Protocol Properties (REP)
Figure 18-5 REP Segment Properties 
Table 18-7 describes the information that is displayed for REP segments.  
						

							  
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Chapter 18      Managing Carrier Ethernet Configurations
  Viewing Resilient Ethernet Protocol Properties (REP)
The following topics describe how to view REP properties related to VLANs: 
VLAN domain views and overlays—See Viewing REP Information in VLAN Domain Views and 
VLAN Overlays, page 18-80.
VLAN service link properties—See Viewing REP Properties for VLAN Service Links, page 18-81.
Table 18-7 REP Segment Properties
Field Description
Segment ID Segment identifier.
Segment Complete Whether the segment is complete; that is, that no port in the segment is 
in a failed state: True or False.
Segment Ports Table
Port Hyperlinked entry to the port in physical inventory. 
Port State Current operational link state of the REP port: None, Init Down, No 
Neighbor, One Way, Two Way, Flapping, Wait, or Unknown. 
Port Type Port type: Primary Edge, Secondary Edge, or Intermediate. 
Port Role Role or state of the REP port depending on its link status and whether it 
is forwarding or blocking traffic: Failed, Alternate, or Open. 
Remote Device Name Name of the neighbor device that this port is connected to on this 
segment. This value can be null. 
Remote Port Name Name of the neighbor port on the neighbor bridge that this port is 
connected to on this segment. This value can be null. 
Blocked VLANs VLANs that are blocked on this port.
Configured Load 
Balancing Blocked 
VLANsList of VLANs configured to be blocked at this port for REP VLAN load 
balancing. 
Preemptive Timer Amount of time, in seconds, that REP waits before triggering 
preemption after the segment is complete. The entry can range from 0 to 
300, or be Disabled. 
The value Disabled indicates that no time delay is configured, and that 
the preemption occurs manually.
This property applies only to REP primary edge ports. 
LSL  Ageout  Timer Using the Link Status Layer (LSL) age-out timer, the amount of time, in 
milliseconds, that the REP interface remains up without receiving a 
hello from a neighbor. 
Remote  Device  MAC MAC address of the neighbor bridge that this port is connected to on this 
segment. This value can be null.  
						

							  
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Chapter 18      Managing Carrier Ethernet Configurations
  Viewing HSRP Properties
Viewing HSRP Properties
Hot Standby Router Protocol (HSRP) is a protocol that provides backup to a router in case of failure. 
Using HSRP, several routers are connected to the same Ethernet network segment and work together to 
present the appearance of a single virtual router. The routers share the same IP and MAC addresses; 
therefore in the event of failure of one router, the hosts on the LAN will be able to continue forwarding 
packets to a consistent IP and MAC address. 
HSRP groups are configured on IP interfaces. An IP interface is modeled by the VNE through the 
IPInterface DC. The IPInterface DC maintains the HSRP related information by the use of HSRP group 
entries. Ethernet DCs, which are used to model Ethernet ports, maintain MAC addresses of the HSRP 
groups.
To view HSRP properties:
Step 1Double-click the required element in the Vision client. 
Step 2In logical inventory, choose Logical Inventory > Routing Entities > Routing Entity. 
Step 3In the IP Interfaces tab, double-click the required interface to view the IP interface properties. If HSRP 
is configured on the IP interface, the HSRP Group tab is displayed as shown in Figure 18-6.
Figure 18-6 HSRP Group Information
Table 18-8 describes the information in the HSRP Group tab. 
						

							  
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Chapter 18      Managing Carrier Ethernet Configurations
  Viewing Access Gateway Properties
Viewing Access Gateway Properties
In an access network, an access gateway configuration ensures loop-free connectivity in the event of 
various failures by sending statically configured bridge protocol data units (BPDUs) toward the access 
network. Using statically configured BPDUs enables the gateway device to act appropriately when 
notified of the following topology changes: 
Failure of a link in the access network.
Failure of a link between the access network and the gateway device.
Failure of an access device.
Failure of a gateway device. 
To view access gateway properties:
Step 1Double-click the element configured for access gateway. 
Step 2In the Inventory window, choose Logical Inventory > Access Gateway >access-gateway. The group 
name is appended by either MSTAG or REPAG, indicating the group type Multiple Spanning Tree 
Access Gateway or Resilient Ethernet Protocol Access Gateway. 
Figure 18-7 shows an example of an access gateway entry in logical inventory. 
Table 18-8 HSRP Group Properties
Field Description
Group Number Number of the HSRP group associated with the interface.
Version Version of the HSRP group.
Port Name Port on which the HSRP is configured.
Priority Value that determines the role each HSRP router plays. 
Values are 1 through 254, with higher numbers having priority over 
lower numbers. 
Coupled Router The partnet router.
State State of the HSRP group: Active or Standby.
Virtual IP Address Virtual IP address assigned to the active router. 
Virtual MAC Address Virtual MAC address assigned to the active router.  
						

							  
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Chapter 18      Managing Carrier Ethernet Configurations
  Viewing Access Gateway Properties
Figure 18-7 Access Gateway in Logical Inventory
Table 18-9 describes the information that is displayed for an access gateway.
Table 18-9 Access Gateway Properties in Logical Inventory
Field Description
Group Name Access gateway group name.
Group Type Group type: MSTAG or REPAG.
Interface Properties
Interface Hyperlink to the interface in physical inventory on which access 
gateway is configured.
Config Name Name of the MSTP region.
The default value is the MAC address of the switch, formatted as a 
text string using the hexadecimal representation specified in IEEE 
Standard 802. 
Max Age In seconds, the maximum age for the bridge.
Values range from 6 to 40 seconds. 
Provider Bridge Whether the current instance of the protocol is in 802.1ad mode: 
True or False. 
Bridge Address Bridge identifier for the interface. 
Port Identifier Port identifier for the interface. 
External Cost External path cost on the current port.
Values range from 1 to 200000000. 
Config Revision Number of the configuration revision.  
						

							  
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Chapter 18      Managing Carrier Ethernet Configurations
  Viewing Access Gateway Properties
Step 3Choose an access gateway instance to view instance properties.
Figure 18-8 shows an example of the information displayed for an access gateway instance. 
Figure 18-8 Access Gateway Instance in Logical Inventory
Table 18-10 describes the information that is displayed for an access gateway instance.  Hello Time Current hello time (in seconds)
Port Active Whether or not the port is active: True or False.
BPDUs Sent Number of BPDUs sent. 
Reversion Control Enabled Whether reversion control is enabled: True or False.
Table 18-9 Access Gateway Properties in Logical Inventory (continued)
Field Description
Table 18-10 Access Gateway Instance Properties
Field Description
Interface Key Hyperlink to the interface in physical inventory on which access 
gateway is configured.
Config Name Name of the MSTP region.
The default value is the MAC address of the switch, formatted as a 
text string using the hexadecimal representation specified in IEEE 
Standard 802. 
Config Revision Number of the configuration revision. 
Max Age In seconds, the maximum age for the bridge.
Values range from 6 to 40 seconds.