[c-nsp] multicast filter / one way

Liviu Pislaru liviu.pislaru at gmail.com
Sat Apr 28 15:44:28 EDT 2007


hello,

i have the topology:
R1 (SVI 460) ---- PE (SVI460/xconnect) ----EoMPLS----PE (SVI460/xconnect) ---- R2 (SVI 460)

R1 - 7613 - s72033-advipservicesk9_wan-mz.122-33.SRA3.bin
R2 - 3550 - c3550-ipservicesk9-mz.122-25.SEE.bin
PE - 3750-ME (both) - c3750me-i5k91-mz.122-25.SEG1.bin

i can't establish OSPF between R1(x.x.x.61/30) and R2(x.x.x.62/30)  because hello packets sent by R2 are not received by R1:

- both interfaces Vlan 460 are up & runn with only one primary /30 ip address. 
- ospf area number is 1 (on both R1 and R2)
- no stub or nssa area
- hello and dead timer values are the same
- ospf enabled on both interfaces SVI 460 of R1 and R2
- no acl, no multicast filtering on switchports

R1#sh ip ospf interface vlan 460 | i Hello
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    Hello due in 00:00:03

R2#sh ip ospf interface vlan 460 | i Hello
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    Hello due in 00:00:07

R1# debug ip ospf hello
Apr 28 22:26:21 EETDST: OSPF: Send hello to 224.0.0.5 area 1 on Vlan460 from x.x.x.62
Apr 28 22:26:31 EETDST: OSPF: Send hello to 224.0.0.5 area 1 on Vlan460 from x.x.x.62
Apr 28 22:26:41 EETDST: OSPF: Send hello to 224.0.0.5 area 1 on Vlan460 from x.x.x.62

R2# debug ip ospf hello
Apr 28 22:26:21 EETDST: OSPF: Send hello to 224.0.0.5 area 1 on Vlan460 from x.x.x.62
Apr 28 22:26:25 EETDST: OSPF: Rcv hello from x.x.x.61 area 1 from Vlan460 x.x.x.61
Apr 28 22:26:25 EETDST: OSPF: End of hello processing



R1# ping 224.0.0.5
Reply to request 0 from x.x.x.62, 16 ms
(R1 send multicast, R2 receive multicast and respond unicast)

R2# ping 224.0.0.5
(no answer because R2 send multicast but R1 doesn't receive it)

does anyone experienced this ? 
it is possible that some how multicast be filtered only one way ?

p.s. - with the same config on all devices but IOS c3550-i5q3l2-mz.121-22.EA2.bin on R2, R2 hadn't been sending any hello packet.


--
liviu. 



 


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