Configure BGP on an Advanced Routing Engine

Configure BGP for a logical router on an Advanced Routing Engine.
Perform the following task to configure BGP for a logical router on an Advanced Routing Engine.
Before you configure BGP, consider the many useful routing profiles and filters that you can apply to BGP peer groups, peers, redistribution rules, and aggregate route policies, and thereby save configuration time and maintain consistency. You can create profiles and filters in advance or as you progress through configuring BGP.
  1. Enable BGP and configure general BGP settings.
    1. Select
      Network
      Routing
      Logical Routers
      and select a logical router.
    2. Select
      BGP
      General
      and
      Enable
      BGP for this logical router.
    3. Assign a
      Router ID
      to BGP for the logical router, which is typically an IPv4 address to ensure the Router ID is unique.
    4. Assign the
      Local AS
      , which is the number of the AS to which the logical router belongs; range is 1 to 4,294,967,295.
    5. If you want to apply BFD to BGP, for
      Global BFD Profile
      select a BFD profile you created, or select the
      default
      profile, or create a new BFD profile; default is
      None (Disable BFD)
      .
    6. Select
      Install Route
      to install learned BGP routes into the global routing table; default is disabled.
    7. Select
      Fast Failover
      to have BGP terminate a session with an adjacent peer if the link to that peer goes down, without waiting for the Hold Time to expire; default is enabled.
    8. Select
      Graceful Shutdown
      to have BGP lower the preference of eBGP peering links during a maintenance operation so that BGP can choose and propagate alternative paths, based on RFC 8326; default is disabled.
    9. Select
      ECMP Multiple AS Support
      if you configured ECMP and you want to run ECMP over multiple BGP autonomous systems; default is disabled.
    10. Enforce First AS
      to cause the firewall to drop an incoming Update packet from an eBGP peer that does not list the eBGP peer’s own AS number as the first AS number in the AS_PATH attribute; default is enabled.
    11. Specify the
      Default Local Preference
      that can be used to determine preferences among different paths; range is 0 to 4,294,967,295; default is 100.
    12. Enable
      Graceful Restart and configure the following timers:
      • Stale Route Time (sec)
        —Specifies the length of time, in seconds, that a route can stay in the stale state (range is 1 to 3,600; default is 120).
      • Max Peer Restart Time (sec)
        —Specifies the maximum length of time, in seconds, that the local device accepts as a grace period restart time for peer devices (range is 1 to 3,600; default is 120).
      • Local Restart Time
        —Specifies the length of time, in seconds, that the local device waits to restart. This value is advertised to peers (range is 1 to 3,600; default is 120).
    13. For
      Path Selection
      :
      • Always Compare MED
        —Enable this comparison to choose paths from neighbors in different autonomous systems; default is disabled.
      • Deterministic MED Comparison
        —Enable this comparison to choose between routes that are advertised by IBGP peers (BGP peers in the same autonomous system); default is enabled.
    14. Click
      OK
      .
  2. Configure a BGP peer group.
    1. Select
      Routing
      Logical Routers
      and select a logical router.
    2. Select
      BGP
      Peer Group
      and
      Add
      a BGP peer group by
      Name
      (maximum of 63 characters). The name must start with an alphanumeric character, underscore (_), or hyphen (-), and contain zero or more alphanumeric characters, underscore, or hyphen. No dot (.) or space is allowed. The name must be unique within the logical router and across all logical routers.
    3. Enable
      the peer group.
    4. Select the
      Type
      of peer group:
      IBGP
      or
      EBGP
      .
    5. To specify many
      IPv4 Address Family
      options for the peer group, select an
      AFI Profile
      that you created, select the
      default
      profile, or create a new BGP Address Family profile; the default is
      None
      .
    6. To specify many
      IPv6 Address Family
      options for the peer group, select an
      AFI Profile
      that you created, select the
      default
      profile, or create a new BGP Address Family profile; the default is
      None
      .
    7. To apply
      IPv4 Filtering Profile
      options to the peer group, select a
      BGP Filtering Profile
      that you created or create a new BGP Filtering profile; the default is
      None
      .
      A BGP Filtering Profile describes how to configure many BGP options for IPv4, such as import or export BGP routes, accept or prevent routes being added to the local BGP RIB, conditionally advertise routes, and unsuppress dampened or summarized routes.
    8. To apply
      IPv6 Filtering Profile
      options to the peer group, select a
      BGP Filtering Profile
      that you created or create a new BGP Filtering profile; the default is
      None
      .
      A BGP Filtering Profile describes how to configure many BGP options for IPv6, such as import or export BGP routes, accept or prevent routes being added to the local BGP RIB, conditionally advertise routes, and unsuppress dampened or summarized routes.
    9. For Connection Options, select an
      Auth Profile
      or create a new BGP Authentication profile to control MD5 authentication between BGP peers in the peer group. Default is
      None
      .
    10. Select a
      Timer Profile
      or create a new BGP Timer Profile to control various BGP timers that affect keepalive and update messages that advertise routes. Default is
      None
      .
    11. Set
      Multi Hop
      —the time-to-live (TTL) value in the IP header (range is 0 to 255; default is 0). The default value of 0 means 1 for eBGP. The default value of 0 means 255 for iBGP.
    12. Select a
      Dampening Profile
      or create a new Dampening Profile to determine how to penalize a flapping route to suppress it from being used until it stabilizes. Default is
      None
      .
  3. Add a BGP peer to the peer group.
    1. Add
      a peer by
      Name
      (maximum of 63 characters). The name must start with an alphanumeric character, underscore (_), or hyphen (-), and contain zero or more alphanumeric characters, underscore, or hyphen. No dot (.) or space is allowed. The name must be unique within the logical router and across all logical routers.
    2. Enable
      the peer; default is enabled.
    3. Select
      Passive
      to prevent the peer from initiating a session with its neighbors; default is disabled.
    4. Enter the
      Peer AS
      to which the peer belongs; range is 1 to 4,294,967,295.
    5. Select
      Addressing
      and select whether the peer will
      Inherit
      IPv4 and IPv6 AFI and filtering profiles from the peer group:
      Yes
      (default) or
      No
      .
    6. If you chose
      Yes
      , specify the following for the peer:
      • For
        Local Address
        , select the
        Interface
        for which you are configuring BGP. If the interface has more than one IP address, select the
        IP Address
        for that interface to be the BGP peer.
      • For
        Peer Address
        , select either
        IP
        and select the IP address or select or create an address object, or select
        FQDN
        and enter the FQDN or address object that is type FQDN.
      The firewall uses only one IP address (from each IPv4 or IPv6 address type) from the DNS resolution of the FQDN. If the DNS resolution returns more than one address, the firewall uses the preferred IP address that matches the IP family type (IPv4 or IPv6) configured for the BGP peer. The preferred IP address is the first address the DNS server returns in its initial response. The firewall retains this address as preferred as long as the address appears in subsequent responses regardless of its order.
    7. If you chose
      No
      for
      Inherit
      addressing from the peer group, specify the following for the peer:
      • To specify many
        IPv4 Address Family
        options for the peer, select an
        AFI Profile
        that you created, select the
        default
        profile, select
        inherit (Inherit from Peer-Group)
        , or create a new BGP Address Family profile; the default is
        none (Disable IPv4 AFI)
        .
        The AFI Profile allows you to specify that the peer is a Route Reflector client. The Route Reflector reflects all the advertisements from all its peers to all the other peers, thus avoiding the need for the iBGP to be fully meshed. If you declare the peer a Route Reflector client, the BGP process reflects all of the updates to that peer.
      • To specify many
        IPv6 Address Family
        options for the peer, select an
        AFI Profile
        that you created, select
        inherit (Inherit from Peer-Group)
        , or create a new BGP Address Family profile; the default is
        none (Disable IPv6 AFI)
        .
        The AFI Profile allows you to specify that the peer is a Route Reflector client. The Route Reflector reflects all the advertisements from all its peers to all the other peers, thus avoiding the need for the iBGP to be fully meshed. If you declare the peer a Route Reflector client, the BGP process reflects all of the updates to that peer.
      • To apply
        IPv4 Filtering Profile
        options to the peer, select a
        BGP Filtering Profile
        that you created, select
        inherit (Inherit from Peer-Group)
        , or create a new BGP Filtering profile; the default is
        none (Disable IPv4 Filtering)
        .
      • To apply
        IPv6 Filtering Profile
        options to the peer, select a
        BGP Filtering Profile
        that you created, select
        inherit (Inherit from Peer-Group)
        , or create a new BGP Filtering profile; the default is
        none (Disable IPv6 Filtering)
        .
      • For
        Local Address
        , select the
        Interface
        for which you are configuring BGP. If the interface has more than one IP Address, select the
        IP address
        for that interface to be the BGP peer.
      • For
        Peer Address
        , select either
        IP
        and select the IP address or select or create an address object, or select
        FQDN
        and enter the FQDN or address object that is type FQDN.
      If a BGP peer group has both an IPv4 Address Family profile and an IPv6 Address Family profile applied to it, all peers belonging to that peer group will automatically have Addressing set to Inherit
      No
      (because a peer cannot use both address families). All peers in the peer group will also have IPv4 Address Family profile, IPv6 Address Family profile, IPv4 Filtering Profile, and IPv6 Filtering Profile set to
      none
      by default. You can select inherit (Inherit from Peer-Group) or override the peer group by selecting a specific profile for the peer. For example, you can configure a peer to
      inherit
      the IPv4 Address Family profile and
      inherit
      the IPv4 Filtering Profile, and select an IPv6 Address Family profile and IPv6 Filtering Profile to override those profiles from the peer group.
    8. Select
      Connection Options
      for the peer in order to apply settings that differ from those of the peer group.
    9. Select an
      Auth Profile
      ,
      inherit (Inherit from Peer-Group)
      (the default), or create a new BGP Authentication profile to control MD5 authentication between BGP peers.
    10. Select a
      Timer Profile
      ,
      inherit (Inherit from Peer-Group)
      (the default), create a new BGP Timer Profile, or select the
      default
      profile to control various BGP timers that affect keepalive and update messages that advertise routes.
    11. Set
      Multi Hop
      , which is the time-to-live (TTL) value in the IP header (range is 0 to 255). The default setting is
      inherit (Inherit from Peer-Group)
      .
    12. Select a
      Dampening Profile
      ,
      inherit (Inherit from Peer-Group)
      (the default), or create a new Dampening Profile to determine how to penalize a flapping route to suppress it from being used until it stabilizes.
    13. Select
      Advanced
      and
      Enable Sender Side Loop Detection
      to have the firewall check the AS_PATH attribute of a route in its FIB before it sends the route in an Update, to ensure that the peer AS number is not on the AS_PATH list. If it is, the firewall removes the AS number to prevent a routing loop.
    14. To apply a
      BFD Profile
      to the peer (which overrides the BFD setting for BGP, as long as BFD is not disabled for BGP at the logical router level), select one of the following:
      • The
        default
        profile.
      • An existing BFD profile.
      • Inherit-lr-global-setting (Inherit Protocol’s Global BFD Profile)
        (default)—Peer inherits the BFD profile that you selected globally for BGP for the logical router.
      • None (Disable BFD)
        for the peer.
    15. Click
      OK
      .
  4. Specify network prefixes to advertise to neighbors.
    The
    Network
    functionality is especially helpful after moving a firewall to a different subnet or after a temporary change in a network.
    1. Select
      Network
      .
    2. Always Advertise Network Route
      (default is enabled) to always advertise the configured network routes to BGP peers, regardless of whether they are reachable or not. If this is unchecked, the firewall advertises the network routes only if they are resolved using the local route table.
    3. Select
      IPv4
      or
      IPv6
      to select type of prefix.
    4. Add
      a
      Network
      prefix to advertise to neighbors.
    5. Select
      Unicast
      to advertise this network route in the Unicast Address Family; default is enabled. If unchecked, the firewall does not advertise the route in the Unicast SAFI.
    6. (
      IPv4 only
      ) Select Multicast to advertise this network route into the Multicast Address Family. Default is disabled; the firewall does not advertise this network route in the Multicast SAFI.
    7. (
      IPv4 only
      ) Select
      Backdoor
      to prevent BGP from advertising the prefix outside of the AS and instead to keep the route within the AS. A backdoor is a BGP route that has a higher administrative distance than an IGP route. Internally, the administrative distance for the prefix is increased so that the prefix isn’t preferred, but is still available if needed, in the event of a link failure elsewhere. Default is disabled.
  5. Redistribute static, connected, OSPF, OSPFv3, or RIPv2 routes into BGP.
    Within a BGP Redistribution Profile, use the flexibility of route maps to specify conditions that determine which routes to redistribute and to specify which attributes to set.
    1. Select
      Redistribution
      .
    2. To redistribute IPv4 routes, for
      IPv4 Redistribution Profile -- Unicast
      , select a BGP Redistribution profile or create a new Redistribution profile; default is
      None
      .
    3. To redistribute IPv6 routes, for
      IPv6 Redistribution Profile -- Unicast
      , select a BGP Redistribution profile or create a new Redistribution profile; default is
      None
      .
  6. Create an aggregate route policy to summarize routes that BGP learns and then advertises to peers.
    1. Select
      Aggregate Route
      and
      Add
      an aggregate route policy by
      Name
      (maximum of 63 characters). The name must start with an alphanumeric character, underscore (_), or hyphen (-), and can contain alphanumeric characters, underscores, and hyphens. No dot (.) or space is allowed.
    2. Enter a helpful
      Description
      of the policy.
    3. Enable
      the policy.
    4. Select
      Summary Only
      to advertise to neighbors only the
      Summary Prefix
      and not the routes that were summarized; this reduces traffic and avoids increasing the size of the neighbors’ routing tables unnecessarily (default is disabled). If you want to advertise both the aggregate route and the individual routes that make up the aggregate route, leave
      Summary Only
      unchecked.
      Summary Only
      and
      Suppress Map
      are mutually exclusive; you cannot specify both.
      If you want to use
      Summary Only
      , but you also want to advertise an individual route, then you create a BGP Filtering Profile that includes an
      Unsuppress Map
      route map that matches on the individual route.
    5. Select
      AS Set
      to advertise the prefix with the list of AS numbers that make up the aggregate route; default is disabled.
    6. Select
      Aggregate Same MED Only
      to cause route aggregation only if routes have the same Multi-Exit Discriminator (MED) values; default is enabled.
    7. Select the
      Type
      of aggregate route:
      IPv4
      or
      IPv6
      .
    8. Calculate the routes you want to summarize and then enter the
      Summary Prefix
      that spans those routes, by specifying an IP address/netmask or address object.
    9. To prevent individual routes from being aggregated (suppress the aggregation), select a
      Suppress Map
      route map or create a new BGP route map whose match criterion specifies an IPv4 or IPv6 address Access List or Prefix List that includes those routes; default is
      None
      .
      Remember that the purpose of the Suppress route map is to prevent certain routes from being aggregated in an advertisement. Therefore, in the route map you
      permit
      the routes that you want to suppress from being aggregated (you don’t
      deny
      the routes that you want to suppress from being aggregated).
      Summary Only
      and
      Suppress Map
      are mutually exclusive; you cannot specify both.
    10. To set attribute information for the Summary Prefix (which has no attributes because you just created that combination of routes), select an
      Attribute Map
      route map or create a new BGP route map and set the attributes for the Summary Prefix (no match criteria). If there is no route map (
      None
      ), the Summary Prefix will have the default attributes. Default is
      None
      .
  7. Click
    OK
    .
  8. (
    Optional
    ) Control BGP routes that are placed in the global RIB.
    You might learn routes and redistribute them, but not want them in the protocol’s local route table or global RIB. You might want to add only specific routes to the global RIB.
    1. Select
      Network
      Routing
      Logical Routers
      and select a logical router.
    2. Select
      RIB Filter
      to allow routes into or prevent routes from being added to the global RIB.
    3. To filter IPv4 BGP routes, in the IPv4 area, for
      BGP Route-Map
      , select a Redistribution Route Map or create a new one.
    4. To filter IPv6 BGP routes, in the IPv6 area, for
      BGP Route-Map
      , select a Redistribution Route Map or create a new one.
    5. Click
      OK
      .

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