Junos OS

Hi,

I am using the following logical systems topology

R1------------R2-------------R3

R1 = designated_source router

R3 = desinated_destinstion router

When a ping packet is generated for R1 for the IGMP group, it says no route to host.

Configs are as below for the logical systems:

R1:

set logical-systems R1 interfaces ge-0/0/0 unit 1 vlan-id 101
set logical-systems R1 interfaces ge-0/0/0 unit 1 family inet address 10.0.0.1/24
set logical-systems R1 interfaces lo0 unit 1 family inet address 1.1.1.1/32
set logical-systems R1 protocols ospf area 0.0.0.0 interface all
set logical-systems R1 protocols ospf area 0.0.0.0 interface fxp0.0 disable
set logical-systems R1 protocols pim rp static address 2.2.2.2
set logical-systems R1 protocols pim interface all mode sparse
set logical-systems R1 protocols pim interface all version 2
set logical-systems R1 protocols pim interface fxp0.0 disable
set logical-systems R1 routing-options router-id 1.1.1.1

R2:

set logical-systems R2 interfaces ge-0/0/0 unit 2 vlan-id 102
set logical-systems R2 interfaces ge-0/0/0 unit 2 family inet address 20.0.0.1/24
set logical-systems R2 interfaces ge-0/0/1 unit 1 vlan-id 101
set logical-systems R2 interfaces ge-0/0/1 unit 1 filter input PACKET_CAPTURE
set logical-systems R2 interfaces ge-0/0/1 unit 1 family inet address 10.0.0.2/24
set logical-systems R2 interfaces gr-0/0/10 unit 0 tunnel source 20.0.0.1
set logical-systems R2 interfaces gr-0/0/10 unit 0 tunnel destination 20.0.0.2
set logical-systems R2 interfaces gr-0/0/10 unit 0 family inet address 21.21.21.1/24
set logical-systems R2 interfaces lo0 unit 2 family inet address 2.2.2.2/32
set logical-systems R2 protocols ospf area 0.0.0.0 interface all
set logical-systems R2 protocols ospf area 0.0.0.0 interface fxp0.0 disable
set logical-systems R2 protocols pim rp local address 2.2.2.2
set logical-systems R2 protocols pim interface all mode sparse
set logical-systems R2 protocols pim interface all version 2
set logical-systems R2 protocols pim interface fxp0.0 disable
set logical-systems R2 routing-options static route 30.0.0.0/24 next-hop 21.21.21.2
set logical-systems R2 routing-options router-id 2.2.2.2

R3:

set logical-systems R3 interfaces ge-0/0/0 unit 3 vlan-id 103
set logical-systems R3 interfaces ge-0/0/0 unit 3 family inet address 30.0.0.1/24
set logical-systems R3 interfaces ge-0/0/1 unit 2 vlan-id 102
set logical-systems R3 interfaces ge-0/0/1 unit 2 filter input PACKET_CAPTURE
set logical-systems R3 interfaces ge-0/0/1 unit 2 family inet address 20.0.0.2/24
set logical-systems R3 interfaces gr-0/0/10 unit 1 tunnel source 20.0.0.2
set logical-systems R3 interfaces gr-0/0/10 unit 1 tunnel destination 20.0.0.1
set logical-systems R3 interfaces gr-0/0/10 unit 1 family inet address 21.21.21.2/24
set logical-systems R3 interfaces lo0 unit 3 family inet address 3.3.3.3/32
set logical-systems R3 protocols igmp interface ge-0/0/0.3 static group 225.1.1.1
set logical-systems R3 protocols ospf area 0.0.0.0 interface all
set logical-systems R3 protocols ospf area 0.0.0.0 interface fxp0.0 disable
set logical-systems R3 protocols pim rp static address 2.2.2.2
set logical-systems R3 protocols pim interface all mode sparse
set logical-systems R3 protocols pim interface all version 2
set logical-systems R3 protocols pim interface fxp0.0 disable
set logical-systems R3 routing-options static route 1.1.1.1/32 next-hop 21.21.21.1
set logical-systems R3 routing-options static route 10.0.0.0/24 next-hop 21.21.21.1
set logical-systems R3 routing-options router-id 3.3.3.3

The output at R1 after ping:

root@vmx1_re# run ping 225.1.1.1 ttl 255 source 1.1.1.1 logical-system R1
PING 225.1.1.1 (225.1.1.1): 56 data bytes
ping: sendto: No route to host
ping: sendto: No route to host
ping: sendto: No route to host

run show multicast route logical-system R1
Instance: master Family: INET

Group: 225.1.1.1
    Source: 1.1.1.1/32
    Upstream interface: local
    Downstream interface list:
        ge-0/0/0.1 pe-0/0/10.229377

Instance: master Family: INET6

Hello,

Please try 

root@vmx1_re# run ping 225.1.1.1 ttl 255 source 1.1.1.1 logical-system R1 bypass-routing interface ge-0/0/0.1 

HTH

Thanks

Alex

Hi Alex,

Many thanks for the help.

Can you please tell me what is the purpose of the command "bypass-routing interface ge-x/x/x". Why is it required for the ping to go successfully?

Thanks

Sumit

the bypass -routing command is used to bypass the routing table and use the interface to send out the icmp request directly.

Hi Marc,

Does this mean even if the router does not have a route for a particular prefix, one can inject a ping packet out of the interface for that particular prefix?

Thanks

Sumit

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@sumit.trehan wrote:

Hi Marc,

 

Does this mean even if the router does not have a route for a particular prefix, one can inject a ping packet out of the interface for that particular prefix?

 

Thanks

Sumit

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Bypass the normal routing tables and send ping requests directly to a system on an attached network. If the system is not on a directly attached network, an error is returned. Use this option to ping a local system through an interface that has no route through it