Junos OS

Hi 

1- I have a vMX router(JMX1). on this router I have a routing-instance type virtual-router(Routing-instance MPLS) which has one interface inside of it.

2- There is another router which is connected to this interface.(JMX2)

3- Also there is another Interface which is not in this routing-instance(JMX3)

4- There is an OSPF adjacency between JMX1 and JMX3 inside inet.0 and JMX1 and JMX2 inside Routing instance MPLS.

5- Those JMX2 and JMX3 have already OSPF and MPLS and LDP neighbors with other connected routers for their own.

6- Now inside of JMX1 I tried to redistribute OSPF routes from inet.0 into MPLS.inet.0 and vice versa.

7- The configuration was OK and JMX2 and JMX3 have their route in their inet.0. I used export and rib-groups(Nothing fancy)

8- Now I tried to do the same with LDP (Inet.3 and MPLS.inet.3)

9- I could successfully do the same inside of JMX1. but this router did not advertise LDP routes to JMX2 and JMX3

10. I enabled Egress policy on JMX1 and the propagation was done but this time inet.3 and MPLS.inet.3 of JMX1 were vanished.

11- Is there any configuration guide or command for doing this? I want to have two separate OSPF domain but I want to maintain the LSP unbroken.

I did my tests on Juniper vLABs which uses JunOS 19

Thank you for your help and support.

I attached the configuration here

Attachment(s)

VM2.txt   14 KB 1 version

Hello,

---

@Asoltanian wrote:

I want to have two separate OSPF domain but I want to maintain the LSP unbroken.

 

---

For this to happen, You need to use "instance-type no-forwarding" .

I labbed up a simple topology for You:

R5[ge-0/0/9.0]-------------[ge-0/0/9.0]R3[ge-1/0/3.0]---------[ge-0/0/3.0]R6
lo0.0 198.51.100.5              lo0.0 198.51.100.3                     lo0.0 198.51.100.6

R5 config:

set protocols ldp track-igp-metric
set protocols ldp interface ge-0/0/9.0
set protocols ospf area 0.0.0.0 interface ge-0/0/9.0
set protocols ospf area 0.0.0.0 interface lo0.0 passive
set routing-options router-id 198.51.100.5
set interfaces ge-0/0/9 unit 0 family inet address 169.254.35.1/31
set interfaces ge-0/0/9 unit 0 family mpls
set interfaces lo0 unit 0 family inet address 198.51.100.5/32

R3 config:

set policy-options policy-statement GRT->NFI term 1 from instance master
set policy-options policy-statement GRT->NFI term 1 from protocol ospf
set policy-options policy-statement GRT->NFI term 1 then accept
set policy-options policy-statement GRT->NFI then reject
set policy-options policy-statement NFI->GRT term 1 from instance OSPF-BLAH
set policy-options policy-statement NFI->GRT term 1 from protocol ospf
set policy-options policy-statement NFI->GRT term 1 then accept
set policy-options policy-statement PL-OSPF-EX term 1 from protocol static
set policy-options policy-statement PL-OSPF-EX term 1 from route-filter 198.51.100.3/32 exact
set policy-options policy-statement PL-OSPF-EX term 1 then accept
set policy-options policy-statement PL-OSPF-EX term 2 from protocol ospf
set policy-options policy-statement PL-OSPF-EX term 2 then accept
set routing-instances OSPF-BLAH routing-options static route 198.51.100.3/32 receive
set routing-instances OSPF-BLAH routing-options router-id 198.51.100.3
set routing-instances OSPF-BLAH routing-options instance-import GRT->NFI
set routing-instances OSPF-BLAH protocols ospf area 0.0.0.0 interface ge-1/0/3.0
set routing-instances OSPF-BLAH protocols ospf export PL-OSPF-EX
set routing-instances OSPF-BLAH instance-type no-forwarding
set routing-instances OSPF-BLAH interface ge-1/0/3.0
set routing-options instance-import NFI->GRT
set routing-options router-id 198.51.100.3
set protocols ldp track-igp-metric
set protocols ldp interface ge-0/0/9.0
set protocols ldp interface ge-1/0/3.0
set protocols ospf area 0.0.0.0 interface ge-0/0/9.0
set protocols ospf area 0.0.0.0 interface lo0.0 passive
set protocols ospf export PL-OSPF-EX
set interfaces ge-0/0/9 unit 0 family inet address 169.254.35.0/31
set interfaces ge-0/0/9 unit 0 family mpls
set interfaces ge-1/0/3 unit 0 family inet address 169.254.0.32/24
set interfaces ge-1/0/3 unit 0 family mpls
set interfaces lo0 unit 0 family inet address 198.51.100.3/32

R6 config:

set protocols ldp track-igp-metric
set protocols ldp explicit-null
set protocols ldp interface ge-0/0/3.0
set protocols ospf area 0.0.0.0 interface ge-0/0/3.0
set protocols ospf area 0.0.0.0 interface lo0.0 passive
set routing-options router-id 198.51.100.6
set interfaces ge-0/0/3 unit 0 family inet address 169.254.0.23/24
set interfaces ge-0/0/3 unit 0 family mpls
set interfaces lo0 unit 0 family inet address 198.51.100.6/32

Verification:

R5:

regress@R5> show ospf neighbor 
Address          Interface              State           ID               Pri  Dead
169.254.35.0     ge-0/0/9.0             Full            198.51.100.3     128    33

regress@R5> show ldp session 
  Address                           State       Connection  Hold time  Adv. Mode
198.51.100.3                        Operational Open          23         DU

regress@R5> show route table inet.3 protocol ldp 

inet.3: 17 destinations, 17 routes (17 active, 0 holddown, 0 hidden)
Restart Complete
+ = Active Route, - = Last Active, * = Both

198.51.100.3/32    *[LDP/9] 00:31:48, metric 1
                    >  to 169.254.35.0 via ge-0/0/9.0
198.51.100.6/32    *[LDP/9] 00:19:01, metric 1
                    >  to 169.254.35.0 via ge-0/0/9.0, Push 44

R3:

regress@R3> show ospf neighbor instance all 
Instance: master
Address          Interface              State           ID               Pri  Dead
169.254.35.1     ge-0/0/9.0             Full            198.51.100.5     128    38

Instance: OSPF-BLAH
Address          Interface              State           ID               Pri  Dead
169.254.0.23     ge-1/0/3.0             Full            198.51.100.6     128    31

regress@R3> show ldp session 
  Address                           State       Connection  Hold time  Adv. Mode
198.51.100.5                        Operational Open          28         DU
198.51.100.6                        Operational Open          28         DU

regress@R3> show route table inet.3 protocol ldp 

inet.3: 9 destinations, 9 routes (9 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

198.51.100.5/32    *[LDP/9] 00:33:29, metric 1
                    >  to 169.254.35.1 via ge-0/0/9.0
198.51.100.6/32    *[LDP/9] 00:24:18, metric 1
                    >  to 169.254.0.23 via ge-1/0/3.0, Push 0

R6:

regress@R6> show ospf neighbor 
Address          Interface              State           ID               Pri  Dead
169.254.0.32     ge-0/0/3.0             Full            198.51.100.3     128    38

regress@R6> show ldp session 
  Address                           State       Connection  Hold time  Adv. Mode
198.51.100.3                        Operational Open          25         DU

regress@R6> show route table inet.3 protocol ldp 

inet.3: 2 destinations, 2 routes (2 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

198.51.100.3/32    *[LDP/9] 00:26:01, metric 0
                    >  to 169.254.0.32 via ge-0/0/3.0
198.51.100.5/32    *[LDP/9] 00:24:44, metric 1
                    >  to 169.254.0.32 via ge-0/0/3.0, Push 43

HTH

Thx

Alex

Hi

Thank you for your efforts on This. I will test this and check the results and I will Inform you

Hi

Another question, about no-forwarding instance: Does this separate the entire OSPF domains from each other. I mean With this instance type I can redistribute routes from OSPF1 into OSPF2 and Vice versa. Is this assumption correct?

Thank you

Hello,

---

@Asoltanian wrote:

Does this separate the entire OSPF domains from each other. I mean With this instance type I can redistribute routes from OSPF1 into OSPF2 and Vice versa. Is this assumption correct?

 

---

Yes. Your assumption is correct.

HTH

Thx

Alex

Hi

I tested your configuration and It worked!!!

Refer to my diagram, I established MP-BGP session between vMX1 and vMX6 while vMX2 has two OSPF domain. vMX5 and vMX4 can ping each other loopback address without any issue.

Some questions here:

1- I don't understand the concept of "no-forward" instance. As documentation says:Use this routing instance type when a separation of routing table information is required. There is no corresponding forwarding table. All routes are installed into the default forwarding tables. IS-IS instances are strictly non forwarding instance types.

Does this means there is no separate table with no-forward. Would you please explain me about the function of no-forward?

2- As I check route there is no route in inet.3 of configured routing-instance.Is this normal?

Thank you

Hi

Sorry for the mistake, I selected my own post as solution...