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Viewing IPv4 Label in BGP Routes
The labeled BGP IPv4 (RFC 3107) enables BGP to distribute MPLS label along the routes it advertises. 
The label mapping information for a particular route is added in the same BGP update message that is 
used to distribute the route itself. The label mapping information is carried as a part of the Network Layer 
Reachability Information (NLRI) in the multiprotocol extension attributes. Hence, the use of any other 
label distribution protocol is eliminated. 
The outer label again identifies the LSP and the inner label identifies the MPLS service. In this case, the 
RFC 3107 edge device replaces the outer label with two labels, generating a three-label stack. 
In Prime Network, the IPv4 BGP Label Routing table displays incoming and outgoing labels. Path tracer 
follows a service that relies on RFC 3107 and it reflects the BGP label in the MPLS label stack. 
RFC3107 is supported on the following device types: ASR9K, ASR901, ASR903, and ME3600/3800X.
To view the BGP label information:
Step 1Double-click the required element in the Vision client.
Step 2Choose Logical Inventory > Routing Entities > Routing Entity.
Step 3In the IPv4 BGP Label Routing table, view the details of incoming and outgoing labels.
Table 17-13 describes the information in the IPv4 BGP Label Routing Table tab. 
Table 17-13 IPv4 BGP Label Routing Table Properties
Prefix Length Length of the network prefix in bits
Next Hop Next routing hop
Incoming Label Incoming BGP label identifier
Outgoing Interfaces Name of the outgoing interface
Outgoing label Outgoing label for the network.
Type Route type: Direct (local), Indirect, or Static
Routing Protocol Routing protocol used to communicate with the other sites: BGP
Table 17-12 Routing Entity Table (continued)
Field Description
Field Description
Destination Destination of the specific network
Prefix Length Length of the network prefix in bits
Next Hop Next routing hop
Incoming Label Incoming BGP label identifier
Outgoing Interfaces Name of the outgoing interface
Outgoing label Outgoing label for the network. 
						

							  
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Viewing the ARP Table
To  v i e w  t h e  A R P  t a b l e :  
Step 1Right-click the required device in the Vision client and choose Inventory. 
Step 2In the logical inventory window, choose Logical Inventory > Routing Entities > Routing 
Entity > ARP. 
Table 17-14 describes the information that is displayed in the ARP table.
Viewing the NDP Table
Neighbor Discovery Protocol (NDP) is used with IPv6 to discover other nodes, determine the link layer 
addresses of other nodes, find available routers, and maintain reachability information about the paths 
to other active Neighbour nodes. 
NDP functionality includes:
Router discovery
Autoconfiguration of addresses (stateless address autoconfiguration [SLAAC])
IPv6 address resolution (replaces Address Resolution Protocol [ARP])
Neighbour reachability (neighbour unreachability detection [NUD])
Duplicate address detection (DAD)
Redirection Type Route type: Direct (local), Indirect, or Static
Routing Protocol Routing protocol used to communicate with the other sites: BGP Field Description
Ta b l e 1 7 - 1 4 A R P  Ta b l e
Field Description
MAC Interface MAC address.
Interface Interface name.
IP Address Interface IP address.
State Interface state: 
Dynamic—The entry was learned by the device according to 
network traffic.
Static—The entry was learned by a local interface or from a user 
configuring a static route. 
Other—The entry was learned by another method not explicitly 
defined.
Invalid—In SNMP, this type is used to remove an ARP entry from 
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To view the NDP table:
Step 1Right-click the required device in the Vision client and choose Inventory. 
Step 2In the logical inventory window, choose Logical Inventory > Routing Entities > Routing 
Entity > ARP Entity. 
Step 3Click the NDP Table tab. 
Figure 17-18 shows an example of the NDP Table tab.
Figure 17-18 NDP Table in Logical Inventory 
Table 17-15 describes the information displayed for NDP. 
						

							  
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Viewing Rate Limit Information
To view rate limit information:
Step 1Right-click the required element in the Vision client and choose Inventory. 
Step 2In the logical inventory window, 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 a rate 
limit is configured on the IP interface, the Rate Limits tab is displayed.
NoteRate Limit information applies only to certain operating systems, such as Cisco IOS.
Ta b l e 1 7 - 1 5 N D P  Ta b l e
Field Description
MAC Interface MAC address.
Interface Interface name.
IP Address Interface IPv6 address. 
Type Entry type: 
ICMP (Incomplete)—Address resolution is being performed on the 
entry. A Neighbour solicitation (NS) message has been sent to the 
solicited-node multicast address of the target, but the corresponding 
Neighbour advertisement (NA) message has not yet been received. 
REACH (Reachable)—Positive confirmation was received via an 
NA that the forward path to the Neighbour was functioning 
properly. While in REACH state, the device takes no special action 
as packets are sent. 
STALE—Too much time has elapsed since the last positive 
confirmation was received that the forward path was functioning 
properly. While in STALE state, the device takes no action until a 
packet is sent.
DELAY—Too much time has elapsed since the last positive 
confirmation was received that the forward path was functioning 
properly. If no reachability confirmation is received within a 
specified amount of time, the device sends an NS message and 
changes the state to PROBE.
PROBE—A reachability confirmation is actively sought by 
resending Neighbour solicitation messages until a reachability 
confirmation is received.  
						

							  
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Table 17-16 describes the information that is displayed in the Rate Limits tab of the IP Interface 
Properties dialog box. 
Viewing VRRP Information
Virtual Router Redundancy Protocol (VRRP) is a non-proprietary redundancy protocol that is designed 
to increase the availability of the static default gateway servicing hosts on the same subnet. This 
increased reliability is achieved by advertising a virtual router (a representation of master and backup 
routers acting as a group) as a default gateway to the hosts instead of one physical router. Two or more 
physical routers are then configured to stand for the virtual router, with only one doing the actual routing 
at any given time. If the current physical router that is routing the data on behalf of the virtual router 
fails, another physical router automatically replaces it. The physical router that forwards data on behalf 
of the virtual router is called the master router; physical routers standing by to take over for the master 
router if needed are called backup routers.
To view VRRP information:
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 VRRP 
is configured on the IP interface, the VRRP Groups tab is displayed.
Table 17-16 Rate Limits Information
Field Description
Type Rate limit direction, either Input or Output.
Max Burst Excess burst size in bytes.
Normal Burst Normal burst size in bytes.
Bit Per Second Average rate in bits per second.
Conform Action Action that can be performed on the packet if it conforms to the specified 
rate limit (rule), for example, continue, drop, change a bit, or transmit.
Exceed Action Action that can be performed on the packet if it exceeds the specified rate 
limit (rule), for example, continue, drop, change a bit, or transmit.
Access List Hyperlink that highlights the related access list in the Access List table. 
						

							  
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Figure 17-19 VRRP Properties in IP Interface Properties Window
Table 17-17 describes the information in the VRRP Groups tab. 
Table 17-17 VRRP Group Properties
Field Description
Group Number Number of the VRRP group associated with the interface.
Priority Value that determines the role each VRRP router plays and what 
happens if the master virtual router fails. 
Values are 1 through 254, with lower numbers having priority over 
higher numbers. 
Master IP Address IP address of the VRRP group, taken from the physical Ethernet 
address of the master virtual router. 
Admin State Administrative status of the VRRP group: Up or Down.
Operation State State of the VRRP group: Master or Backup.
Preempt Mode Whether or not the router is to take over as the master virtual router 
for a VRRP group if it has a higher priority than the current master 
virtual router: Enabled or Disabled. 
Virtual IP Address IP address of the virtual router. 
Virtual MAC Address MAC address of the virtual router. 
Advertisement Interval Amount of time (in seconds) between successive advertisements by 
the master virtual router.  
						

							  
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Viewing Label Switched Entity Properties
Logical inventory can display any or all of the following tabs for label switched entities, depending on 
the configuration: 
Label Switching Table—Describes the MPLS label switching entries used for traversing MPLS core 
networks. 
LDP Neighbours—Details all MPLS interface peers that use the Label Distribution Protocol (LDP). 
LDP enables Neighbouring provider (P) or PE routers acting as label switch routers (LSRs) in an 
MPLS-aware network to exchange label prefix binding information, which is required to forwarding 
traffic. The LSRs discover potential peers in the network with which they can establish LDP sessions 
in order to negotiate and exchange the labels (addresses) to be used for forwarding packets.
Two LDP peer discovery types are supported:
–Basic discovery—Used to discover directly connected LDP LSRs. An LSR sends hello 
messages to the all-routers-on-this-subnet multicast address, on interfaces for which LDP has 
been configured.
–Extended discovery—Used between indirectly connected LDP LSRs. An LSR sends targeted 
hello messages to specific IP addresses. Targeted sessions are configured because the routers 
are not physically connected, and broadcasting would not reach the peers. The IP addresses of 
both peers are required for extended discovery.
If two LSRs are connected with two separate interfaces, two LDP discoveries are performed. 
MPLS Interfaces—Contains information on MPLS interfaces and whether traffic engineering 
tunnels are configured on an interface. 
MPLS Label Range—Identifies whether MPLS uses static or dynamic routing, and the label range.
Traffic Engineering LSPs—Describes the MPLS traffic engineering Label Switched Paths (LSPs) 
provisioned on the switch entity. MPLS traffic engineering LSP, an extension to MPLS TE, provides 
flexibility when configuring LSP attributes for MPLS TE tunnels. 
VRF Table—Describes MPLS paths that terminate locally at a VRF. 
To view information for label switched entities: 
Step 1Double-click the required device in the Vision client. 
Step 2In the logical inventory window, choose Logical Inventory > LSEs > Label Switching.
Table 17-18 describes the information that is displayed for label switched entities. 
Table 17-18 Label Switching Properties in Logical Inventory
Field Description
Local LDP ID Local Label Distribution Protocol (LDP) identifier.
LDP Process State State of the LDP process, such as Running, Down, or Unknown.
MPLS Interfaces
ID Identifier for MPLS interface, as a combination of IP address and 
interface name.
Distribution Protocol Type Distribution protocol used: Null, LDP, TDP (Tag Distribution 
Protocol), RSVP, or TDP and LDP. 
						

							  
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MPLS  TE  Properties Whether or not traffic engineering (TE) properties are configured on 
the interface:
Checked—MPLS TE properties are configured on the interface.
Unchecked—MPLS TE properties are not configured on the 
interface. 
Discovery Protocols Discovery protocols used on the interface. 
Label Switching Table
Incoming Label Incoming MPLS label identifier. 
Action Type of switching action: Null, Pop, Swap, Aggregate, Untagged, or 
Act. If an action is defined as Pop, an outgoing label is not required. 
If an action is defined as Untagged, an outgoing label is not present.
Outgoing Label Outgoing label. 
Out Interface Name of the outgoing interface, displayed as a hyperlink to the port 
subinterface in physical inventory.
IP Destination Destination IP address.
Destination Mask Subnet mask of the destination.
Next Hop IP address of the next hop in the path. The IP address is used for 
resolving the MAC address of the next MPLS interface that you 
want to reach.
VRF Table
Incoming Label Incoming VRF label identifier.
Action Type of switching action: Null, Pop, Swap, Aggregate, Untagged, or 
Act. 
VRF VRF name, hyperlinked to its location in logical inventory.
IP Destination Destination IP address.
Destination Mask Subnet mask of the destination.
Next Hop IP address of the next hop in the path. The IP address is used for 
resolving the MAC address of the next MPLS interface that you 
want to reach.
Out Interface Name of the outgoing interface, displayed as a hyperlink to the port 
subinterface in physical inventory.
Traffic Engineering LSPs
LSP Name Label switched path (LSP) name. 
LSP Type Segment type: Head, Midpoint, or Tail.
Source Address Source IP address.
Destination Address Destination IP address.
In Label Incoming label, if not a head segment. 
In Interface Incoming interface, if not a head segment.
Out Interface Outgoing interface, if not a tail segment.
Table 17-18 Label Switching Properties in Logical Inventory (continued)
Field Description 
						

							  
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Out Label Outgoing label, if not a tail segment. 
Average Bandwidth (Kbps) Current bandwidth (in Kb/s) used to automatically allocate the 
tunnel’s bandwidth.
LSP ID LSP identifier.
Burst (Kbps) Tunnel bandwidth burst rate, in Kb/s.
Peak (Kbps) Tunnel bandwidth peak rate, in Kb/s.
FRR TE Tunnel Fast Reroute (FRR) TE tunnel name, hyperlinked to the routing 
entity in logical inventory. 
FRR TE Tunnel State State of the FRR TE tunnel: 
Active—A failure exists in the primary tunnel and the backup 
is in use.
Not Configured—The primary tunnel has no designated backup 
tunnel.
Ready—The primary tunnel is in working condition.
MPLS Label Range
MPLS Label Type Type of MPLS label: Dynamic or Static. 
Minimum Label Value Lowest acceptable MPLS label in the range.
Maximum Label Value Highest acceptable MPLS label in the range.
LDP Neighbours
LDP ID Identifier of the LDP peer.
Transport IP Address IP address advertised by the peer in the hello message or the hello 
source address.
Session State Current state of the session: Transient, Initialized, Open Rec, Open 
Sent, or Operational. 
Protocol Type Protocol used by the peer to establish the session: LDP, TDP, or 
Unknown. 
Label Distribution Method Method of label distribution: Downstream, Downstream On 
Demand, Downstream Unsolicited, or Unknown. 
Session Keepalive Interval Length of time (in milliseconds) between keepalive messages.
Session Hold Time The amount of time (in milliseconds) that an LDP session can be 
maintained with an LDP peer, without receiving LDP traffic or an 
LDP keepalive message from the peer.
Discovery Sources Whether the peer has one or more discovery sources:
Checked—Has one or more discovery sources.
Unchecked—Has no discovery sources.
NoteTo see the discovery sources in the LDP Neighbor 
Properties window, double-click the row of the peer in the 
table.
Table 17-18 Label Switching Properties in Logical Inventory (continued)
Field Description 
						

							  
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Step 3Double-click an entry in any of the tables to view additional properties for that entry.
Multicast Label Switching (mLADP)
Multicast Label Distribution protocol (mLDP) provides extensions to the Label Distribution Protocol 
(LDP) for the setup of point-to-multipoint (P2MP) and multipoint-to-multipoint (MP2MP) Label 
Switched Paths (LSPs) in MPLS networks. A P2MP LSP allows traffic from a single root (or ingress) 
node to be delivered to a number of leaf (or egress) nodes.
A MP2MP LSP allows traffic from multiple ingress nodes to be delivered to multiple egress nodes. Only 
a single copy of the packet will be sent on any link traversed by a multipoint LSP. Container is the holder 
of MPLS MLDP databases and neighbors instances for Multicast.
Viewing MLDP Database Information
To view the MLDP database information:
Step 1Double-click the required device in the Vision client. 
Step 2In the logical inventory window, choose Logical Inventory > LSEs > Label Switching > Multicast 
Label Switching > Databases. The database information is displayed in the MLDP Databases content 
pane.
Step 3Select a database from the content pane, right-click and choose the Properties option. The MLDP 
Database Properties dialog box is displayed. You can click on the tabs to view more details.
Table 17-20 describes the information that is displayed for MLDP Database Properties dialog box. 
Table 17-19 Additional Properties Available from Label Switching in Logical Inventory
Double-click an entry in this tab... To display this window...
Label Switching Table Label Switching Properties
LDP Neighbors LDP Peer Properties
MPLS Interfaces MPLS Link Information - MPLS Properties
MPLS Label Range MPLS Label Range Properties
Traffic Engineering LSPs Tunnel Properties
VRF Table MPLS Aggregate Entry Properties