Question

Unfeasible routes if next-hop learn with OSPF


Userlevel 4
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)

0 replies

Be the first to reply!

Reply