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Beginner

Are OSPF hello's actually being Tx.

Hi. (thanks for reading :)

I am trying to establish a simple OSPF neighborship between a juniper and Cisco 7606 (WS-X6708-10GE) with some issues. (it works in the GNS3 lab no problem)

The Cisco 7606 would appear to be sending (tx) hello messages, but the MX is not receiving and therefore the stuck in OSPF INIT state. I have tried various MTU and IP MTU setting as originally thought it could be this. But no.

I can confirm both routers using 10 second hello, different router id, subnet mask, area id etc

From a cisco debug and packet trace, the cisco sends (Tx) the hello packet out the interface. But juniper does not receive (Rx) it from juniper capture.

who's telling porky pies ? Any ideas ?

thank again, Matt

p.s
I can ping fine .
its a direct back-to-back ethernet link

 …………………………………………………………………………………………..

 

CISCO config:

interface TenGigabitEthernet2/4

mtu 9216

ip mtu 9178
ip address 10.254.254.13 255.255.255.252

 

router ospf 10

router-id 10.10.0.10

network 10.254.254.12 0.0.0.3 area 0

 

cisco router#show ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface

10.254.254.102  128   INIT/DROTHER    00:00:32    10.254.254.14   TenGigabitEthernet2/4

 Debug

 5d20h: OSPF: rcv. v:2 t:1 l:44 rid:10.254.254.102 aid:0.0.0.0 chk:D8B1 aut:0 auk: from TenGigabitEthernet2/4

5d20h: OSPF: Rcv hello from 10.254.254.102 area 0 from TenGigabitEthernet2/4 10.254.254.14

5d20h: OSPF: Send immediate hello to nbr 10.254.254.102, src address 10.254.254.14, on TenGigabitEthernet2/4

5d20h: OSPF: Send hello to 10.254.254.14 area 0 on TenGigabitEthernet2/4 from 10.254.254.13

……………………………

Packet trace

 

6d01h: IP: s=10.254.254.13 (local), d=224.0.0.5 (TenGigabitEthernet2/4), len 80, output feature, Post-Ingress-NetFlow(51), rtype 0, forus FALSE, sendself FALSE, mtu 0

…………………………………………….

 

 cisocrouter#ping 10.254.254.14

 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.254.254.14, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms

 

…………………………………………………………………………………………..

 xe-0/2/8 {

    mtu 9192

    unit 0 {

        family inet {

            address 10.254.254.14/30;

 

R02-re0# show protocols ospf

area 0.0.0.0 {

    interface xe-0/2/8.0;

 

R02-re0# run show ospf interface detail

Interface           State   Area            DR ID           BDR ID          Nbrs

xe-0/2/8.0          DR      0.0.0.0         10.254.254.102  0.0.0.0            0

  Type: LAN, Address: 10.254.254.14, Mask: 255.255.255.252, MTU: 9178, Cost: 1

  DR addr: 10.254.254.14, Priority: 128

  Adj count: 0

  Hello: 10, Dead: 40, ReXmit: 5, Not Stub

  Auth type: None

  Protection type: None

  Topology default (ID 0) -> Cost: 1

 

 R02-re0# run show interfaces xe-0/2/8 detail | match MTU

  Link-level type: Ethernet, MTU: 9192, MRU: 9200, LAN-PHY mode, Speed: 10Gbps, BPDU Error: None, MAC-REWRITE Error: None, Loopback: None, Source filtering: Disabled,

    Protocol inet, MTU: 9178, Generation: 517, Route table: 0

    Protocol mpls, MTU: 9166, Maximum labels: 3, Generation: 518, Route table: 0

    Protocol multiservice, MTU: Unlimited, Generation: 519, Route table: 0

 

britannic@GS1-MX_R02-re0# run show ospf statistics | match Hell

   Hello          sent 27084           Received  0           0             0

 

R02-re0# run show ospf neighbor

 

{master}[edit]

 

2 REPLIES 2
VIP Expert

Hi,

Hi,

Does the peering work without enabling jumbo frames on both devices?

Also, I don't see lo0 under protocol OSPF on the MX.

set protocol ospf area 0 inter lo0 passive

show protocol ospf to verify

HTH

Highlighted
Beginner

Hi,

Hi,

thank you the for response.

I tried with and without jumbo frames, no joy though. 

I also tried the juniper loopback config, but still not joy.

The debug from the cisco thinks the hello is leaving the line card (WS-X6708-10GE). but the Juniper never see it. I think there is an issue with the Cisco 10G line card and ospf.

Ideally need to monitor port and wireshark. But not possible due to DC location.

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