Border Gateway Protocol (BGP) Help

Help For BGP4 Address Aggregation Configuration

Selection Criteria

• Address Aggregation Entry - This consists of
  • Prefix - The Aggregation Prefix
  • Prefix Length - The Aggregation Prefix Length

Configurable Data

• Prefix - Enter the Aggregation Prefix. The Value should be a valid IP Address. An IP Address cannot be reused to create a new entry. An error message will be displayed to indicate creation failure.
• Prefix Length - Enter the Aggregation Prefix Length. The valid values are (0 to 32). Prefix Length can be configured only when a new Aggregation Entry is created.

Non-Configurable Data

• Prefix Length - Displays the configured Aggregation Prefix Length.

Command Buttons

• Submit - This will add a new aggregation entry in the aggreagation table if all the entered fields are correct.
• Delete - This will delete the entry which matches the Prefix and Prefix Length that is selected in the Address Aggregation Entry field. This will be visible only when the user has readwrite permissions and there is at least one entry in the table.

Help For BGP4 Dampened Paths Table

Selection Criteria

Non-Configurable Data

• Prefix - Displays the Route Prefix
• Prefix Length - Displays the Route Prefix Length
• State - Displays whether the route is SUPPRESSED,NOT SUPPRESSED or REUSED
• Penalty Value - Displays the accumulated penalty value for this route
• Decay Decrement - Displays the calculated decay for timer decrement
• Time Created - Displays the creation time of this route
• Time Suppressed - Displays the time at which the route entered into suppressed state
• Event State - Displays the last event responsible for the state of the route which can be FLAP ADD EVENT or FLAP WITHDRAW EVENT or FLAP INITIALIZE EVENT

Command Buttons

• Refresh - This displays the latest configuration data from the router

Help For BGP4 Global Configuration

Non-Configurable Data

• Version - Displays supported BGP4 protocol version numbers.

Configurable Data

• Admin Mode - Select either Enable or Disable to Administratively enable/disable the BGP4 protocol on this router.
• Local Identifier - The system identification of the BGP4 Router. Generally, this is the Router IP Address.
• Local AS- Enter the local autonomous system number. Should be valid positive decimal number. Valid range is (1 to 65535)
• Propagate MED Mode - Enable or disable the propagation of the MultiExitDisc (MED) metric.
• Calculate MED Mode - Enable or disable the use of the Calculated MED attribute. The MED attribute is used to describe the degree of preference of a particular link.
• Adver of Ext Border Routers - Enable or disable the advertisement External Border Routers in the Nexthop
• Auto Restart Mode - Enable or disable automatic message sending in the case of connection failure.
• Minimum AS Origination Interval - Sets the Time interval in seconds for the MinASOriginationInterval timer The suggested value for this timer is 15 seconds. The valid values are (1 to 32767 secs)
• Minimum Route Advertisement Interval - Set the Time interval in seconds for the MinRouteAdvertisementInterval timer The suggested value for this timer is 30 seconds. The valid values are (1 to 32767 secs)
• Route Reflector Mode - Enable or disable the route reflection mode. If enabled, the BGP4 speaker will re-advertise to other BGP4 neighbor's routes.
• Optional Capabilities Supported - Enable or disable the optional capabilities. These optional capabilities allow a BGP4 speaker to be aware of the protocol extension capabilities of a BGP4 neighbor. By default, all capabilities are disabled. The possible optional capabilities are MultiProtocol, RouteReflection, Community and Confederation.
• Cluster ID - The cluster ID to which the router belongs. The Cluster value is a valid IP address. The cluster ID is optionally configurable.
• Confederation ID - An externally visible autonomous system number that identifies the confederation as a whole. The valid values are (0 to 65535). The confederation ID is optionally configurable
• Address Family - Configure the Address Family with a Subsequent AFI Identifier (SAFI). The AFI identifies a supported protocol, and is defined as having the value of IP version 4. The SAFI describes a sub-AFI value that is supported for the AFI. The possible values for are unicast, multicast, unicast-multicast and labeldist. The Address Family is optionally configurable.
• Default Metric - Sets a default for the metric of redistributed routes.This field displays the default metric if one has already been set or blank if not configured earlier. The valid values are (0 to 4294967295)
• Default Information Originate - Enable or Disable Default Route Advertise.

Command Buttons

• Submit - Send the updated configuration to the router. Configuration changes take effect immediately. These changes will not be retained across a power cycle unless a save is performed.
• Refresh - Refresh the screen.

Help For BGP4 Local NLRI Configuration

Configurable Data

• Prefix - Enter the prefix of the NLRI entry being created. This object is an IP address containing the prefix with length specified by bgp4PathAttrIpAddrPrefixLen. Any bits beyond the length specified by bgp4PathAttrIpAddrPrefixLen are zeroed.
• Prefix Length - Enter the length in bits of the IP address prefix of the NLRI entry being created. The valid values are (0 to 32)
• Next Hop - Enter the address of the border router that should be used for the destination network. This should be a valid IP address.
• Send Now - Set whether to send the route update immediately or not. If you select 'Send' it will be sent immediately.

Command Buttons

• Submit - Send the updated configuration to the router. Configuration changes take effect immediately. These changes will not be retained across a power cycle unless a save is performed.
• Delete - This deletes the selected NLRI entry from the table.

Help For BGP4 Local Originated Path Configuration

Configurable Data

• Route Origin - Set the local origin for locally originated routes. The valid values are 'igp', 'egp' and 'incomplete'
• Route MED - Sets Multi Exit Discriminator value for locally originated routes. The valid values are (-1 to 2147483647)
• Route Local Preference- Set the Local Preference value for locally originated routes. The valid values (-1 to 2147483647)
• Suppress Mode - Sets whether to select or not select less specific routes only.
• Route Community - Set the Local assosiated community. The valid values are (1 to 65535)
• Next Hop Address Length - Sets the Local Route Length of Next Hop Network Address. The valid values are (1 to 128)
• Address Aggregation Mode - Enable/Disable the Adderss Aggregation.

Command Buttons

• Refresh - This displays the latest configuration data from the router.
• Configure - Each of these buttons configures the BGP4 local configuration parameter it is adjacent to.

Help For BGP4 Path Attributes Table

Non-Configurable Data

• Peer ID- Displays the IP address of the peer where the path information was learned.
• Prefix/Length - Displays the Prefix address and the length in bits of the IP address prefix.
• Route Local Origin - Displays the ultimate origin of the path information.
• AS Path Segment - Displays the sequence of AS path segments. Each AS path segment is represented by a triple (type, length, value)
• Next Hop - Displays the address of the border router that should be used for the destination network.
• Route Local MED - Displays Multi Exit Discriminator. This metric is used to discriminate between multiple exit points to an adjacent autonomous system. A value of -1 indicates the absence of this attribute.
• Route Local Preference - Displays the originating BGP4 speaker's degree of preference for an advertised route. A value of -1 indicates the absence of this attribute.
• Atomic Aggregate - Displays Present or Not Present. Present indicates that the local system has selected a less specific route over a more specific route, and information may be missing.
• Aggregator AS - Displays the AS number of the last BGP4 speaker that performed route aggregation. A value of zero (0) indicates the absence of this attribute.
• Aggregator Address - Displays the IP address of the last BGP4 speaker that performed route aggregation. A value of 0.0.0.0 indicates the absence of this attribute.
• Calculated Local Preference - Displays the degree of preference calculated by the receiving BGP4 speaker for an advertised route. A value of 0 indicates the absence of this attribute
• Best - Displays an indication of whether or not this route was chosen as the best BGP4 route.
• Unknown Attributes - Displays one or more path attributes not understood by this BGP4 speaker. Size zero (0) indicates the absence of such attribute(s). Octets beyond the maximum size, if any, are not recorded by this object.

Command Buttons

• Refresh - Refreshes the screen with the recent information form the router.

Help For BGP4 Route Flap Configuration

Configurable Data

• Route Flap Mode - This field is used to indicate whether the damping of the route flaps is enabled or not. It can either be enabled or disabled.
• Suppress Limit - This field is used to display or modify the damping suppress limit for the route flaps.
• Reuse Limit -This field is used to display or modify the reuse limit of the dampened route.
• Penalty Increment - This field is used to display or modify the penalty increment for the route flaps.
• Delta Time - This field is used to display or modify the delta time used for the dampened routes
• Flap Max Time - This field is used to display or modify the maximum flap entry time for the route.
• Damping Factor - This field is used to display or modify the exponential decay factor for the flapped routes.
• Reuse Size - This field is used to display or modify the maximum reuse aray size.

Command Buttons

• Submit - Send the updated configuration to the router. Configuration changes take effect immediately. These changes will not be retained across a power cycle unless a save is performed.

Help For BGP4 SNPA Configuration

Configurable Data

• SNPA Address - Enter the address of the Subnetwork Point of Attachment(SNPA) you want to Add or Delete. This must be a valid IP Address.
• SNPA Address Length - Enter the length of the SNPA you want to Add or Delete. The valid values are (1 to 128)

Non-Configurable Data

• SNPA Address - Displays Addresses of Subnetwork Point of Attachment (SNPA) that exist within the local system. This must be a valid IP Address.
• SNPA Address Length - Displays Lengths of the Subnetwork Point of Attachment.

Command Buttons

• Add - This will add a new SNPA entry into the BGP4 SNPA table. If any of the values are invalid, an error message will be displayed.
• Delete - This will delete an entry from the SNPA table, which matches the entered SNPA Address and Length. If no entry is matching a message is being displayed.
• Refresh - Refreshes the screen with new SNPA table entries from the router.

Help For BGP Route Redistribution Configuration

Configurable Data

• Configured Source - This select box is a dynamic selector and would be populated by only those Source Routes that have already been configured for redistribute by BGP. However, the topmost option in the select box would be "Create", and this allows the user to configure another, among the Available Source Routes. The valid values are 'Static', 'Connected', 'RIP', 'OSPF' and 'Create'.
• Available Source - This select box is a dynamic selector and would be populated by only those Source Routes that have not previously been configured for redistribution by BGP. This select box would appear only if the user selects "Create" option as Configured Source. The valid values are 'Static', 'Connected', 'RIP' and 'OSPF'.
• Metric- Sets the metric value to be used as the metric of redistributed routes. This field displays the metric if the source was pre-configured and can be modified. The valid values are (0 to 4294967295)
• Match - One or more of these checkboxes must be selected to set the type of OSPF routes to be redistributed. This field would appear only if Source is "OSPF". This field displays the configured match options if "OSPF" was pre-configured and can be modified.
  • Internal - Sets Internal OSPF Routes to be redistributed
  • External 1 - Sets External Type 1 OSPF Routes to be redistributed
  • External 2 - Sets External Type 2 OSPF Routes to be redistributed
  • NSSA-External 1 - Sets NSSA External Type 1 OSPF Routes to be redistributed
  • NSSA-External 2 - Sets NSSA External Type 2 OSPF Routes to be redistributed
  The default is Internal.
• Distribute List - Sets the Access List that filters the routes to be redistributed by the destination protocol. Only permitted routes are redistributed. If this command refers to a non-existent access list, all routes are permitted. The valid values for Access List IDs are (1 to 199).
When used for route filtering, the only fields in an access list that get used are
• Source IP Address and netmask
• Destination IP Address and netmask
• Action (permit or deny)
All other fields (source and destination port, precedence, tos, etc.) are ignored.
The source IP address is compared to the destination IP address of the route. The source IP netmask in the access list rule is treated as a wildcard mask, indicating which bits in the source IP address must match the destination address of the route. (Note that a 1 in the mask indicates a "don’t care" in the corresponding address bit.)
When an access list rule includes a destination IP address and netmask (an extended access list), the destination IP address is compared to the network mask of the destination of the route. The destination netmask in the access list serves as a wildcard mask, indicating which bits in the route’s destination mask are significant for the filtering operation.

Command Buttons

• Submit - Send the updated configuration to the router. Configuration changes take effect immediately.
• Delete - Delete the entry of the Source Route selected as Configured Source from the list of Sources configured for BGP Route Redistribution.

Help For BGP Route Redistribution Summary

Non Configurable Data

• Source - The Source Route to be Redistributed by BGP.
• Metric- The Metric of redistributed routes for the given Source Route. Displays "Unconfigured" when not configured.
• Match - List of Routes redistributed when "OSPF" is selected as Source. The list may include one or more of:
  • Internal
  • External 1
  • External 2
  • NSSA-External 1
  • NSSA-External 2
• Distribute List - The Access List that filters the routes to be redistributed by the Destination Protocol. Displays 0 when not configured.

Command Buttons

• Refresh - Displays the latest BGP Route Redistribution Configuration data.