Bgp network command in juniper

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The neighbor statement creates the mesh. The full mesh need not be physical links. Rather, the configuration on each routing device must create a full mesh of peer sessions using multiple neighbor statements.

The requirement for a full mesh is waived if you configure a confederation or route reflection. The reason for preventing the readvertisement of IBGP routes and requiring the full mesh is to avoid routing loops within an AS. Because the attribute is only modified across AS boundaries, this system works well. However, the fact that the attribute is only modified across AS boundaries presents an issue inside the AS.

The route is then sent to Device C, which installs it locally and sends it back to Device A. If Device A installs the route, a loop is formed within the AS. The routing devices are not able to detect the loop because the AS path attribute is not modified during these advertisements. For route reachability, the IBGP peers are fully meshed. A recursive route lookup resolves the loopback peering address to an IP forwarding next hop.

No special configuration beyond device initialization is required before you configure this example. The loopback interface lo0 is used to establish connections between IBGP peers. If there is a route to the loopback address, the IBGP peer session stays up.

If a physical interface address is used instead and that interface goes up and down, the IBGP peer session also goes up and down. Thus, if the device has link redundancy, the loopback interface provides fault tolerance in case the physical interface or one of the links goes down. The local-address statement enables you to specify the source information in BGP update messages. When this happens, the peer session is not established because a mismatch exists between the expected source address the egress interface of the peer and the actual source the loopback interface of the peer.

To make sure that the expected source address matches the actual source address, specify the loopback interface address in the local-address statement. A recursive route lookup resolves the loopback peer address to an IP forwarding next hop.

In this example, this service is provided by OSPF. Although interior gateway protocol IGP neighbors do not need to be directly connected, they do need to be fully meshed. In the sample network, the devices in AS 17 are fully meshed in the group internal-peers. The devices have loopback addresses Figure 5 shows a typical network with internal peer sessions. Other useful options for this scenario might be to accept routes learned through OSPF or local routes.

From configuration mode, confirm your configuration by entering the show interfaces , show policy-options , show protocols , and show routing-options commands. The following example requires that you navigate various levels in the configuration hierarchy. From operational mode, enter the show bgp neighbor command.

From operational mode, enter the show bgp group command. From operational mode, enter the show bgp summary command. Verify that the export policy configuration is causing the BGP routes to be installed in the routing tables of the peers. From operational mode, enter the show route protocol bgp command. Figure 6 shows a typical network with internal peer sessions. If the output does not display the intended configuration, repeat the configuration instructions in this example to correct it.

From the operational mode, enter the show bgp neighbor command. From the operational mode, enter the show bgp group command. From the operational mode, enter the show bgp summary command. From the operational mode, enter the show route protocol bgp command. In complex networks such as Data Center or Cloud, link-local addresses are widely used due to the high number of links and nodes.

Being able to deploy multiple single-hop BGP sessions for Juniper devices using link-local addresses is a significant advantage. Starting in Junos OS Release This example shows how to configure multiple single-hop EBGP sessions on different links using the same IPv6 link-local address.

Prior to Junos OS Release Starting in Junos OS In this example, you configure multiple single-hop EBGP sessions on two different links using the same IPv6 link-local address. Configure basic set up, including vlan-tagging, vlan-id, loopback and IPv6 link-local addresses for R1 and R2. Verify your configuration by checking the below configurations from devices as follows:.

Use the show bgp summary command to verify the EBGP sessions created on the devices with the same link-local address through different interfaces. Help us improve your experience. Let us know what you think.

Do you have time for a two-minute survey? Maybe Later. BGP Peering Sessions. Note: On SRX Series devices, you must enable the expected host-inbound traffic on the specified interfaces or all interfaces of the zone. Overview Figure 2 shows a network with BGP peer sessions. Configuration Procedure CLI Quick Configuration Step-by-Step Procedure Results CLI Quick Configuration To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, and then copy and paste the commands into the CLI at the [edit] hierarchy level.

Step-by-Step Procedure The following example requires you to navigate various levels in the configuration hierarchy.

Results From configuration mode, confirm your configuration by entering the show interfaces , show protocols , and show routing-options commands. Verification Confirm that the configuration is working properly. Action From operational mode, run the show bgp neighbor command.

Action From operational mode, run the show bgp group command. Action From operational mode, run the show bgp summary command. BGP Configuration Overview.

Requirements In this example, no special configuration beyond device initialization is required. Configuration Procedure Configuring the External BGP Sessions Procedure CLI Quick Configuration Step-by-Step Procedure CLI Quick Configuration To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, copy and paste the commands into the CLI at the [edit] hierarchy level, and then enter commit from configuration mode.

To configure the BGP peer sessions: Run the show interfaces terse command to verify that the physical router has a logical tunnel lt interface.

PurgePending —This flag marks one or more routing table also known as routing information base [RIB] entries for deletion.

The purge job to delete these entries begins after the peer is closed. A purge job keeps running if new routing table entries are marked for deletion. PurgeInProgress —The purge job has started and is not yet complete. PurgeImpatient —The purge begins as a low priority background job. The Adj-RIB-Out can be cleaned up and a new peering can be established in the background before all routes are deleted.

After the peer goes down and the group has closed, the purge becomes a normal priority job. Sync —This peer is synchronized with the rest of the peer group. TryConnect —Another attempt is being made to connect to the peer. HoldTime —The session ended because the hold timer expired. Open —The local routing device sent a BGP open message to the peer. OpenFail —The local routing device did not receive an acknowledgment of a BGP open message from the peer.

Cease —An error occurred, such as a version mismatch, that caused the session to close. AddressFamily —Configured address family: inet or inet-vpn. If this option is configured the device does not go into graceful restart helper mode. DropPathAttributes —Certain path attributes are configured to be dropped from neighbor updates during inbound processing. HoldTime —Hold time configured with the hold-time statement. The hold time is three times the interval at which keepalive messages are sent.

IgnorePathAttributes —Certain path attributes are configured to be ignored in neighbor updates during inbound processing. Local Address —Address configured with the local-address statement. Multihop —Allow BGP connections to external peers that are not on a directly connected network. Preference —Preference value configured with the preference statement. Refresh —Configured to refresh automatically when the policy changes.

Appears only if the authentication-keychain statement has been configured Name of the authentication keychain enabled. Appears only if the authentication-algorithm statement has been configured Type of authentication algorithm enabled: hmac or md5.

The counter resets only after the peer resets. Options associated with the remove-private statement. Hold time configured with the hold-time statement. TrafficStatistics —Collection of statistics for labeled-unicast traffic is enabled. Options —Options configured for collecting statistics about labeled-unicast traffic. Time between sample periods for labeled-unicast traffic statistics, in seconds. Preference value configured with the preference statement. This field is displayed in the output only if the out-delay parameter is configured to a non-zero value.

Shard sync —Syncincg peer up with shards. If the peer is in shard sync state, it also displays a hex value indicating which shards are yet to send peer up acknowledgement. Thread sync complete —Peer has been synced in update threads and shards. Peer UP acknowledgement received from Update Thread —Display peer up acknowledgement received from update threads. Index number for the BGP peer group. The index number differentiates between groups when a single BGP group is split because of different configuration options at the group and peer levels.

Name of directly connected interface over which direct EBGP peering is established. Zero leading elements are omitted, for example, a value less than one week do not include the weeks. Names of address families and stale time that the BGP peer supports for restarter mode for BGP long-lived graceful restart.

Names of address families NLRIs for which that stale routes are held or preserved when BGP graceful restart receiver mode is active for a neighbor. Amount of time remaining on the stale timer until which end-of-RIB EoR markers are assumed when BGP graceful restart receiver mode is active for a neighbor. Time until stale routes are deleted or become long-lived stale.

Amount of time up to which stale routes are deleted or become long-lived stale routes when BGP graceful restart receiver mode is active for a neighbor. Address families supported by the peer: unicast or multicast. When graceful restart is negotiated, the maximum time allowed to hold routes from neighbors after the BGP session has gone down. When this field appears, the BGP speaker has restarted Restarting , and this peer should not wait for the end-of-rib marker from the speaker before advertising routing information to the speaker.

Address families for which end-of-routing-table markers are received from the neighbor. Address families for which end-of-routing-table markers are sent to the neighbor. The peer is running Junos OS Release 9. NLRIs for which peer can receive multiple paths. Appears in the command output of the local router if the downstream peer is configured to receive multiple BGP routes to a single destination, instead of only receiving the active route. NLRIs for which peer can send multiple paths: inet-unicast.

Appears in the command output of the local router if the upstream peer is configured to send multiple BGP routes to a single destination, instead of only sending the active route. Bit —Number that represents the entry in the routing table for this peer. Send state —State of the BGP group: in sync , not in sync , or not advertising. Active prefixes —Number of prefixes received from the peer that are active in the routing table. Received prefixes —Total number of prefixes from the peer, both active and inactive, that are in the routing table.

Accepted prefixes —Total number of prefixes from the peer that have been accepted by a routing policy. Suppressed due to damping —Number of routes currently inactive because of damping or other reasons. These routes do not appear in the forwarding table and are not exported by routing protocols.

Last time any traffic was received from the peer or sent to the peer, and the last time the local routing device checked. Messages that BGP has received from the receive socket buffer, showing the total number of messages, number of update messages, number of times a policy is changed and refreshed, and the buffer size in octets.

The buffer size is 16 KB. Messages that BGP has written to the transmit socket buffer, showing the total number of messages, number of update messages, number of times a policy is changed and refreshed, and the buffer size in octets. Number of BGP packets that are queued to be transmitted to a particular neighbor for a particular routing table. If update threading is enabled, the Output Queue field will display the Output Queue count from update threads with an additional field that displays the Output Queue count per RIB as fetched from main or shards.

The output queue of routing tables that are not advertised, will only show up at extensive output level. The counter is cumulative. For example, the counter is increased after the remote peer either resends or clears the outbound route filtering prefix list. The immediate flag indicates that the BGP peer should readvertise the updated routes.

An example follows. This sample output is applicable for both the prefix-limit and accepted-prefix-limit configuration statements.

Help us improve your experience. Let us know what you think. Do you have time for a two-minute survey? Maybe Later. Description Display information about BGP peers. Options none Display information about all BGP peers. Required Privilege Level view.

Output Fields Table 1 describes the output fields for the show bgp neighbor command. AS AS number of the peer. Local Address of the local routing device.

Type Type of peer: Internal or External. CleanUp —The peer session is being shut down. Delete —This peer has been deleted. Idled —This peer has been permanently idled. Initializing —The peer session is initializing. SendRtn —Messages are being sent to the peer. Unconfigured —This peer is not configured. WriteFailed —An attempt to write to this peer failed.

Start —The peering session started. Stop —The peering session stopped. Last error Last error that occurred in the BGP session: Cease —An error occurred, such as a version mismatch, that caused the session to close.

Hold Time Expired —The session's hold time expired. None —No errors occurred in the BGP session. Export Name of the export policy that is configured on the peer. Import Name of the import policy that is configured on the peer. AutheKeyChain —Authentication key change is enabled. GracefulRestart —Graceful restart is configured. Rib-group —Configured routing table group.

Path-attributes dropped Path attribute codes that are dropped from neighbor updates. Path-attributes ignored Path attribute codes that are ignored during neighbor updates. Authentication key change Appears only if the authentication-keychain statement has been configured Name of the authentication keychain enabled. Authentication algorithm Appears only if the authentication-algorithm statement has been configured Type of authentication algorithm enabled: hmac or md5.

Address families configured Names of configured address families for the VPN. Local Address Address of the local routing device. Remove-private options Options associated with the remove-private statement. Holdtime Hold time configured with the hold-time statement.

Flags for NLRI inet-label-unicast Flags related to labeled-unicast: TrafficStatistics —Collection of statistics for labeled-unicast traffic is enabled. Traffic statistics Information about labeled-unicast traffic statistics: Options —Options configured for collecting statistics about labeled-unicast traffic.

File —Name and location of statistics log files. Traffic Statistics Interval Time between sample periods for labeled-unicast traffic statistics, in seconds. Preference Preference value configured with the preference statement. Number of flaps Number of times the BGP session has gone down and then come back up. Threads related state Displays thread related state if update threading is enabled: Thread sync pending —Thread sync is yet to begin. Update thread sync —Syncing peer up with update threads.

Peer ID Router identifier of the peer. Group index Index number for the BGP peer group. Peer index Index that is unique within the BGP group to which the peer belongs.

Local ID Router identifier of the local routing device. Local Interface Name of the interface on the local routing device. Active holdtime Hold time that the local routing device negotiated with the peer.

Keepalive Interval Keepalive interval, in seconds. Time until end-of-rib is assumed for stale routes Amount of time remaining on the stale timer until which end-of-RIB EoR markers are assumed when BGP graceful restart receiver mode is active for a neighbor. Time until stale routes are deleted or become long-lived stale Amount of time up to which stale routes are deleted or become long-lived stale routes when BGP graceful restart receiver mode is active for a neighbor.

NLRI for restart configured on peer Names of address families configured for restart. NLRI advertised by peer Address families supported by the peer: unicast or multicast. NLRI for this session Address families being used for this session. Restart time configured on peer Configured time allowed for restart on the neighbor. Stale routes from peer are kept for When graceful restart is negotiated, the maximum time allowed to hold routes from neighbors after the BGP session has gone down.

Peer does not support Restarter functionality Graceful restart restarter-mode is disabled on the peer. Peer does not support Receiver functionality Graceful restart helper-mode is disabled on the peer. Restart time requested by this peer Restart time requested by this neighbor during capability negotiation. Restart flag received from the peer When this field appears, the BGP speaker has restarted Restarting , and this peer should not wait for the end-of-rib marker from the speaker before advertising routing information to the speaker.

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