Routing

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  • 1.  ospf irb interface is not able to reach one of the IP's in irb local/direct interface

    Posted 4 days ago

    Hi Team,

    I m suspecting its a routing issue in Juniper router. I have 2 servers connected to router. 2 servers are having each one virtual machines installed.

    For 1st server, i have untagged vlan 216  and 2nd server is having untagged vlan 600. 

    From SC-2 virual machine, i am unable to reach IP 172.181.107 (traffic VM )

    SC-2 -- Virtual Machine in Server 1

    Traffic VM -- Virtual Machine in 2nd Server

    From router, i am able to ping 172.18.1.107 but from SC-2 machine its follow this path:

    SC-2:~ # tracepath -n 172.18.1.107
     1?: [LOCALHOST]                      pmtu 1452
     1:  no reply
     2:  214.20.178.48                                         0.622ms asymm  3
     3:  169.254.0.1                                           1.114ms
     4:  192.168.216.254                                       8.935ms
     5:  no reply
     6:  no reply
     7:  no reply

    Show route command in juniper

    172.18.1.0/24      *[Direct/0] 02:14:27
                        >  via irb.600
    172.18.1.1/32      *[Local/0] 02:14:27
                           Local via irb.600

    192.168.216.254/32 *[Local/0] 2w6d 21:56:45
                           Local via irb.216

    214.20.178.48/32   *[OSPF/100] 3d 01:06:53, metric 11
                           to 192.168.216.1 via irb.216
                        >  to 192.168.216.2 via irb.216

    i have enabled OSPF routing for irb.216 

    irb.216 is having  vlan - 216 -- 192.168.216.254/24

    irb.600 is having vlan 600 --- 172.18.1.1/24

    As in the routing table irb.216 and irb.600 are both direct and local to juniper, why there is no packet travels from 192.168.216.254 to 172.18.1.107??

    can anyone please help me??



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    HARINDER SINGH
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  • 2.  RE: ospf irb interface is not able to reach one of the IP's in irb local/direct interface

    Posted 3 days ago

    Can anyone please comment....



    ------------------------------
    HARINDER SINGH
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  • 3.  RE: ospf irb interface is not able to reach one of the IP's in irb local/direct interface

    Posted 3 days ago

    Hi Harinder,

    • Can you share the configuration of the VLANs and the irb interfaces? We should see an entry for the direct 192.168.216.0/24 as well, just as we have 172.18.1.1/32 (local /32 entry for the irb IP) and 172.18.1.0/24 (for the directly connected subnet.
    • What is the source IP of SC-2 VM from where the trace was originated?
    • Two VLANs were mentioned in the post are VLAN 600 - 172.18.1.0/24 and VLAN 216 - 192.168.216.0/24. Are the servers configured to use the irbs on the switch (172.18.1.1 and 192.168.216.254) as their gateways? I would have expected the first hop in the trace to be 192.168.216.254 if the Juniper router was the gateway, but the trace shows 214.20.178.48 as the first hop?

    Regards



    ------------------------------
    Sheetanshu Shekhar
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  • 4.  RE: ospf irb interface is not able to reach one of the IP's in irb local/direct interface

    Posted 3 days ago

    will let u soon the configuration of SC-2 and Vlan info in juniper



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    HARINDER SINGH
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