OSPF between 6506 & ALU 7750 1

[dvtestguy]

Cannot get an OSPF link active between a C6506 & ALU 7750.

[C6506 g1/2 -- (OSPF Area 0)-- ALU 7750 p1/1/19]

cisco6506#sh run int g1/2
interface GigabitEthernet1/2
description 7750-p1/1/19-OSPF
mtu 9198
ip address 4.4.4.3 255.255.255.0
ip ospf network broadcast
no cdp enable
end

cisco6506#sh ip ospf database

OSPF Router with ID (4.4.4.3) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
4.4.4.3 4.4.4.3 789 0x80000038 0x00D1FD 1

cisco6506#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
N/A 1 DOWN/DROTHER - 4.4.4.4 GigabitEthernet1/2

cisco6506#sh ip ospf summary-address
OSPF Process 1, Summary-address
4.4.4.0/255.255.255.252 Metric 16777215, Type 0, Tag 0

cisco6506#sh ip ospf interface
GigabitEthernet1/2 is up, line protocol is up (connected)
Internet Address 4.4.4.3/24, Area 0
Process ID 1, Router ID 4.4.4.3, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 4.4.4.3, Interface address 4.4.4.3
Backup Designated router (ID) 2.2.2.2, Interface address 4.4.4.4
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:05
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 3
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)


ALU configs:
* Note: the 2.2.2.2 address is the ALU system address on a /32 mask.

*A:7750 ESS# configure router ospf area 0 interface "to-Cisco-6506"
*A:7750 ESS>config>router>ospf>area>if# info
----------------------------------------------
interface-type broadcast
mtu 9198
*A:7750 ESS# configure router interface "to-Cisco-6506"
*A:7750 ESS>config>router>if# info
----------------------------------------------
address 4.4.4.4/24
port 1/1/19

Cisco Troubleshooting:

cisco6506#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
N/A 1 DOWN/DROTHER 00:00:05 4.4.4.4 GigabitEthernet1/2

cisco6506#
44w1d: %OSPF-5-ADJCHG: Process 1, Nbr 0.0.0.0 on GigabitEthernet1/2 from DOWN to DOWN, Neighbor Down: Dead timer expired
44w1d: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on GigabitEthernet1/2 from EXSTART to DOWN, Neighbor Down: Too many DBD retransmitions

 

[Cluebird]

Check for mtu mismatch.

Debug ip ospf adj.

Interface command is: ip ospf ignore-mtu

or adjust mtu on both sides.

 

[dvtestguy]

Hi Cluebird,

I did check MTU before and matched both 9198, and decided to recheck. On the Cisco g1/2 interface, I had matched to the ALU router interface "to-C6506", not the physical interface. Once I changed that to match the 6506 both 9212, OSPF now up!

Does it matter whether the ports are broadcast or point-to-point? I need the 6506 switch able to get respond to IGMP.

Many thanks!

 

[ADB100]

If there are no other OSPF speakers on this subnet then you can make them both point-to-point. It will slightly improve the times it takes to form an adjacency since there will be no DR/BDR election. I assume from your comment about IGMP there are end stations on this subnet? I wouldn't recommend that. A P2P OSPF link should be just that - ideally using /30 or /31 addressing. But I realise this isn't always possible.
You haven't explained your mulicast requirements so I can't comment further on IGMP?

Andy

Andy

 

[Cluebird]

p2p or b'cast as long as you are the same on both ends. The biggest issue with trying to mix p2p and b'cast is the DR requirement for b'cast.

For the IGMP, you'll need to enable PIM on the appropriate interfaces. However, as Andy states without more information, can't be too helpful here.

 

[dvtestguy]

Sorry for the delay...

Both interface addresses are on a /24 mask and p2p. Cisco 4.4.4.3/24 & ALU7750 4.4.4.4/24

cisco6506#sh run int g1/2
interface GigabitEthernet1/2
description 7750-p1/1/19-OSPF
mtu 9198
ip address 4.4.4.3 255.255.255.0
ip pim sparse-mode
ip ospf network point-to-point
no cdp enable
end


IGMP:

1) IGMP Client on vlan int 100
2) Mcast traffic generator on vlan int 201
3) Note: I did have this working on a pure L2 Cisco network with L3 interfaces, but forced to move to a router and use the 6506 as edge switch where my IGMP clients reside for Joins, and traffic gen traffic now on the ALU7750.

interface Vlan201
description "IGMP source vlan traffic generator"
ip address 10.115.201.5 255.255.255.0
ip pim sparse-mode
ip igmp version 3

cisco6506#sh ip pim rp (2.2.2.2 being the ALU system interface)
Group: 232.255.201.1, RP: 2.2.2.2, v2, uptime 00:22:06, expires never
Group: 224.0.1.40, RP: 2.2.2.2, v2, uptime 12w6d, expires never

cisco6506#sh ip igmp groups
232.255.201.1 Vlan100 00:20:04 stopped 142.142.142.101

interface Vlan100
description "IGMP L3 Vlan int"
ip address 10.115.100.5 255.255.255.0
ip pim query-interval 60
ip pim sparse-mode
ip igmp version 3
ip igmp snooping querier

interface GigabitEthernet1/0/16
description "IGMP Client Join 142.142.142.101"
switchport access vlan 100
switchport mode access
switchport nonegotiate

 

[dvtestguy]

Cluebird/ADB100,

Any thoughts on how to get mcast from the router to the c6506?

cisco6506#sh run int g1/2
Building configuration...

Current configuration : 197 bytes
!
interface GigabitEthernet1/2
description 7750-p1/1/19-OSPF
mtu 9198
ip address 4.4.4.3 255.255.255.0
ip pim sparse-mode
ip igmp version 3
ip ospf network point-to-point
no cdp enable
end

cisco6506#sh int g1/2
GigabitEthernet1/2 is up, line protocol is up (connected)
Hardware is C6k 1000Mb 802.3, address is 0011.935f.34d5 (bia 0011.935f.34d5)
Description: 7750-p1/1/19-OSPF
Internet address is 4.4.4.3/24
MTU 9198 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is SX
input flow-control is off, output flow-control is on
Clock mode is auto
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:02, output 00:00:09, output hang never
Last clearing of "show interface" counters 2w3d
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
614539 packets input, 53571904 bytes, 0 no buffer
Received 614406 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
406022 packets output, 31334532 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out