Unfeasible routes if next-hop learn with OSPF

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Create Date: Apr 15 2013 9:12PM

Hello,

Have problem with unfeasible routes if next-hop was learn OSPF (XOS 15.2.2.7)
# sh bgp routes network 10.33.33.0/24

 Routes:

     Destination         Peer            Next-Hop        LPref Weight MED        AS-Path

----------------------------------------------------------------------------------------

u i  10.33.33.0/24       82.144.193.144  82.144.195.142  140   1      0          42982

u i  10.33.33.0/24       82.144.193.150  82.144.195.142  140   1      0          42982

u i  10.33.33.0/24       82.144.193.145  82.144.195.142  140   1      0          42982

u i  10.33.33.0/24       82.144.193.151  82.144.195.142  140   1      0          42982

 

Flags: (*) Preferred BGP route, (>) Active, (d) Suppressed, (h) History

       (s) Stale, (m) Multipath, (u) Unfeasible

 

Origin: (?) Incomplete, (e) EGP, (i) IGP

BGP Route Statistics Matching the Display Criteria

  Feasible Routes   : 0

  Active Routes     : 0

  Rejected Routes   : 0

  Unfeasible Routes : 4

 

Next-hop at rib & reachable:

 

# rtlookup 82.144.195.142

Ori  Destination        Gateway         Mtr  Flags         VLAN       Duration

#o1  82.144.195.140/30  77.120.1.62     22   UG-D---um--f- vlan187    0d:1h:34m:42s

 in KB I'm find next  info
Goal: What makes BGP routes show as Unfeasible under the 'show bgp route all' command?
Why: Two reasons cause such behavior:

- Local VLAN is not ipforwading enabled (as below example).
- Route's next-hop is unreachable.

But



Local vlan ip forwarding:

 

# sh vlan vlan186

VLAN Interface with name vlan186 created by user

        Admin State:    Enabled         Tagging:        802.1Q Tag 186

        Description:    agg-1.f17 - cr-1.f17

        Virtual router: VR-Default

        IPv4 Forwarding: Enabled

        Primary IP    : 77.120.1.53/30

        IPv6 Forwarding: Disabled

        IPv6:           None

        STPD:           None

        Protocol:       Match all unfiltered protocols

        Loopback:       Disabled

        NetLogin:       Disabled

        QosProfile:     None configured

        Egress Rate Limit Designated Port: None configured

        Flood Rate Limit QosProfile:       None configured

        Ports:   1.       (Number of active ports=1)

           Tag:       *1g

        Flags:    (*) Active, (!) Disabled, (g) Load Sharing port

                  (b) Port blocked on the vlan, (m) Mac-Based port

                  (a) Egress traffic allowed for NetLogin

                  (u) Egress traffic unallowed for NetLogin

                  (t) Translate VLAN tag for Private-VLAN

                  (s) Private-VLAN System Port, (L) Loopback port

                  (x) VMAN Tag Translated port

 

 

Next-hop reachable:

 

# rtlookup 82.144.195.142

Ori  Destination        Gateway         Mtr  Flags         VLAN       Duration

#o1  82.144.195.140/30  77.120.1.62     22   UG-D---um--f- vlan187    0d:3h:58m:52s

 

# ping coun 3 82.144.195.142

Ping(ICMP) 82.144.195.142: 3 packets, 8 data bytes, interval 1 second(s).

16 bytes from 82.144.195.142: icmp_seq=0 ttl=63 time=24 ms

16 bytes from 82.144.195.142: icmp_seq=1 ttl=63 time=16 ms

16 bytes from 82.144.195.142: icmp_seq=2 ttl=63 time=16 ms

 

--- 82.144.195.142 ping statistics ---

3 packets transmitted, 3 packets received, 0% loss

round-trip min/avg/max = 16/19/24 ms

(from pacan4ik1_pacan4ik1)
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Posted 4 years ago

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