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FAQ - Why Does an IP Routing Table on NE5000E Not Contain Information About BGP Routes

Publication Date:  2013-09-24 Views:  71 Downloads:  0
Issue Description

Why does an IP routing table on NE5000E not contain information about BGP routes?

Version: VRP (R) software, Version 5.70 (NE5000E V300R007C00SPC500)

For example:

On the 218.75.221.0/24 network segment, the output of dis ip routing-table 218.X.Y.0 verbose contains only information about the preferred O_ASE route but does not contain information in the output of dis bgp routing-table 218.X.Y.0.

<ZZ-ZXJ-CR-1.MAN.NE5000E>dis ip routing-table 218.X.Y.0 verbose
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Table : Public
Summary Count : 2

Destination: 218.X.Y..0/24
     Protocol: O_ASE           Process ID: 1
   Preference: 150                   Cost: 10
      NextHop: 61.187.95.134    Neighbour: 0.0.0.0
        State: Active Adv             Age: 2d02h37m38s
          Tag: 0                 Priority: low
        Label: NULL               QoSInfo: 0x0
   IndirectID: 0x0             
 RelayNextHop: 0.0.0.0          Interface: GigabitEthernet1/0/4
     TunnelID: 0x0                  Flags:  D

Destination: 218.X.Y.0/24
     Protocol: O_ASE           Process ID: 1
   Preference: 150                   Cost: 10
      NextHop: 61.187.95.234    Neighbour: 0.0.0.0
        State: Active Adv             Age: 2d02h37m32s
          Tag: 0                 Priority: low
        Label: NULL               QoSInfo: 0x0
   IndirectID: 0x0             
 RelayNextHop: 0.0.0.0          Interface: GigabitEthernet1/0/5
     TunnelID: 0x0                  Flags:  D

<NE5000E> dis bgp routing-table 218.X.Y..0

 BGP local router ID : 61.137.1.33
 Local AS number : 64903
 Paths:   2 available, 1 best, 1 select
 BGP routing table entry information of 218.X.Y..0/24:
 Imported route.
 From: 0.0.0.0 (0.0.0.0)
 Route Duration: 2d02h37m43s
 Direct Out-interface: GigabitEthernet1/0/4
 Original nexthop: 61.187.95.134
 Qos information : 0x0
 AS-path Nil, origin incomplete, MED 0, suppressed, pref-val 0, valid, local, best, select, pre 150
 Not advertised to any peer yet

 BGP routing table entry information of 218.X.Y..0/24:
 RR-client route.
 From: 61.187.97.6 (61.187.97.6)
 Route Duration: 00h44m27s 
 Relay IP Nexthop: 61.187.95.134
 Relay IP Out-Interface: GigabitEthernet1/0/4
 Original nexthop: 61.187.97.6
 Qos information : 0x0
 AS-path Nil, origin igp, MED 0, localpref 100, pref-val 0, valid, internal, pre 200, not preferred for route type
 Not advertised to any peer yet

The definition of dis ip routing-table A.X.Y.Z verbose in related documentation is as follows:

Displays detailed information about active routes and inactive routes. If the parameter is not specified, only the summary of active routes is displayed.

Why is the preceding BGP route not written to the IP routing table?
Handling Process
None
Root Cause
None
Solution

According to rules for adding routes to an IP routing table in VRP5, only routes preferred by routing protocols are added to the IP routing table.

BGP prefers an imported route. That is, the route preferred by BGP is an OSFP route selected from the IP routing table. Therefore, the BGP route does not need to be added into the IP routing table.

<NE5000E> dis bgp routing-table 218.X.Y..0

 BGP local router ID : 61.137.1.33
 Local AS number : 64903
 Paths:   2 available, 1 best, 1 select
 BGP routing table entry information of 218.X.Y..0/24:

Imported route===BGP prefers an imported route. That is, the route preferred by BGP is an OSFP route selected from the IP routing table.

 From: 0.0.0.0 (0.0.0.0)
 Route Duration: 2d02h37m43s
 Direct Out-interface: GigabitEthernet1/0/4
 Original nexthop: 61.187.95.134
 Qos information : 0x0
 AS-path Nil, origin incomplete, MED 0, suppressed, pref-val 0, valid, local, best, select, pre 150
 Not advertised to any peer yet

 BGP routing table entry information of 218.X.Y..0/24:
 RR-client route.
 From: 61.187.97.6 (61.187.97.6)
 Route Duration: 00h44m27s 
 Relay IP Nexthop: 61.187.95.134
 Relay IP Out-Interface: GigabitEthernet1/0/4
 Original nexthop: 61.187.97.6
 Qos information : 0x0
 AS-path Nil, origin igp, MED 0, localpref 100, pref-val 0, valid, internal, pre 200, not preferred for route type
 Not advertised to any peer yet
Suggestions
None

END