From: Mike Schlenger (mschlenger@xxxxxxxxxxxxxxxx)
Date: Tue Jan 30 2001 - 17:16:14 GMT-3
I had a similar issue with EIGRP on a 4006 at a customer site (with the L3
module). To resolve the issue, I had to change the native vlan back to 1.
Try it out if the network is broken. Here is my L3 config.
hostname CAT4K-LISLE-R1
!
enable secret 5 $1$xSW7$7tubGvx4ZubPlB5mEb0zI1
!
clock timezone CDT -6
clock calendar-valid
ip subnet-zero
no ip domain-lookup
!
!
!
interface Port-channel1
no ip address
no ip redirects
ip directed-broadcast
hold-queue 300 in
!
interface Port-channel1.1
encapsulation dot1Q 1 native
no ip directed-broadcast
!
interface Port-channel1.100
encapsulation dot1Q 100
ip address 172.20.1.254 255.255.255.0
no ip redirects
ip directed-broadcast
ip summary-address eigrp 1 172.20.0.0 255.255.252.0
!
interface Port-channel1.200
encapsulation dot1Q 200
ip address 172.20.2.254 255.255.255.0
ip helper-address 172.20.1.22
no ip redirects
ip directed-broadcast
!
interface Port-channel1.300
encapsulation dot1Q 300
ip address 172.20.3.254 255.255.255.0
ip helper-address 172.20.1.22
no ip redirects
ip directed-broadcast
!
interface FastEthernet1
no ip address
no ip directed-broadcast
!
interface GigabitEthernet1
no ip address
no ip directed-broadcast
!
interface GigabitEthernet2
no ip address
no ip directed-broadcast
!
interface GigabitEthernet3
no ip address
no ip directed-broadcast
no negotiation auto
channel-group 1
!
interface GigabitEthernet4
no ip address
no ip directed-broadcast
no negotiation auto
channel-group 1
!
router eigrp 1
redistribute static
passive-interface FastEthernet1
network 172.20.0.0
default-metric 64 200 255 1 1500
no auto-summary
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.20.1.1
!
Regards
Mike Schlenger
-----Original Message-----
From: Cal Michael [mailto:cmichael@network-data.com]
Sent: Tuesday, January 30, 2001 2:13 PM
To: ccielab@groupstudy.com
Subject: Off Topic - Weird OSPF issue with 4006 platform.
- Yeah, this probably belongs in alt.cisco, but when TAC is being
slow. . .
- Issue: Have two 4006's each equipped with the SupII, L3 module,
4604 Access Gateway, 6 port Gig modules, and loaded with
the latest in IOS technology.
The SupII is in module 1, the Access Gateway (AG) is in 5,
the L3 module in 6. The SupII's two GE ports connect as
a trunk, two VLAN's (including the native VLAN of 64) to
the other 4006. The 4006's treat the SupII ports as L2
ports. The L3's two GE ports are connected together like
the SUPII's. However, since the Catayst portion of this
switch is ignorant of these ports existence, the L3 module
treats them like two physical GE ports.
OSPF works like a champ. No fancy configuration, just
announcing a network block like it should. Tied to a
loopback. Adjacencies form without issue for all VLAN's
(about 12) and in between the 4006 on the L3 segments.
Since this is with the network core - only Area 0 is
configured. DR's, BDR's all good. Life is good.
Now introduce the AG's to the mix. OSPF weirds out.
The AG has a "GE" port to the backplane. This virtual
GE port is set up to belong to VLAN 64. Adjacencies
form between the AG's and the L3's, between the AG's,
and between the L3's in both 4006's. All except one
segment. And yes, it's random which one will get
stuck in 2-way, DROTHER. But always, only one link -
in native VLAN 64 (the AG actually is ignorant of this,
but the Cat L2 portion isn't). It could be between an
AG and the remote L3, it has been between L3 to L3 on
VLAN 64 only (other VLAN's form adjacencies fine).
No rhyme, no reason. You can reset a module, and the
problem goes away until the blade reloads and begins
to form adjacencies again and a single segment becomes
affected again. There is full connectivity on the
segment, the other side pings fine. No filters are
present. The network still hums along, just one
segment will not form up. . .
Pull the AG's, and the issue goes away. . .
There is little documentation of these AG modules.
One confidential FAQ mentions that the gateways "only
support two route paths". This seems interpretable
in many ways - even has Cisco stumped. . .
- Snipped from show ip ospf neighbor. Vlan 64 is a port channel
ending in 64, and addresses with 64 as the third octet are the
IP subnet associated with it.
4006-CC1-L3#show ip ospf neigh
Neighbor ID Pri State Dead Time Address Interface
10.254.254.252 1 FULL/DR 00:00:33 172.20.95.2
GigabitEthernet1
10.254.254.252 1 FULL/DR 00:00:33 172.20.95.6
GigabitEthernet2
172.20.64.6 1 FULL/BDR 00:00:35 172.20.64.6
Port-channel1.64
172.20.64.7 1 FULL/DR 00:00:36 172.20.64.7
Port-channel1.64
10.254.254.252 1 2WAY/DROTHER 00:00:33 172.20.64.3
Port-channel1.64
10.254.254.252 1 FULL/DR 00:00:33 172.20.65.3
Port-channel1.65
172.20.67.5 1 FULL/DR 00:00:33 172.20.67.5
Port-channel1.67
10.254.254.252 1 FULL/BDR 00:00:33 172.20.67.3
Port-channel1.67
10.254.254.252 1 FULL/DR 00:00:33 172.20.68.3
Port-channel1.68
10.254.254.252 1 FULL/DR 00:00:33 172.20.69.3
Port-channel1.69
10.254.254.252 1 FULL/DR 00:00:33 172.20.70.3
Port-channel1.70
10.254.254.252 1 FULL/DR 00:00:32 172.20.72.3
Port-channel1.72
10.254.254.252 1 FULL/DR 00:00:32 172.20.73.3
Port-channel1.73
10.254.254.252 1 FULL/DR 00:00:32 172.20.161.3
Port-channel1.177
4006-CC1-L3#
Neighbor ID Pri State Dead Time Address Interface
10.250.250.253 1 FULL/BDR 00:00:34 172.20.95.1
GigabitEthernet1
10.250.250.253 1 FULL/BDR 00:00:34 172.20.95.5
GigabitEthernet2
172.20.64.6 1 FULL/BDR 00:00:36 172.20.64.6
Port-channel1.64
10.250.250.253 1 2WAY/DROTHER 00:00:34 172.20.64.2
Port-channel1.64
172.20.64.7 1 FULL/DR 00:00:37 172.20.64.7
Port-channel1.64
10.250.250.253 1 FULL/BDR 00:00:34 172.20.65.2
Port-channel1.65
172.20.67.5 1 FULL/DR 00:00:32 172.20.67.5
Port-channel1.67
10.250.250.253 1 FULL/DROTHER 00:00:34 172.20.67.2
Port-channel1.67
10.250.250.253 1 FULL/BDR 00:00:34 172.20.68.2
Port-channel1.68
10.250.250.253 1 FULL/BDR 00:00:34 172.20.69.2
Port-channel1.69
10.250.250.253 1 FULL/BDR 00:00:34 172.20.70.2
Port-channel1.70
10.250.250.253 1 FULL/BDR 00:00:34 172.20.72.2
Port-channel1.72
10.250.250.253 1 FULL/BDR 00:00:34 172.20.73.2
Port-channel1.73
10.250.250.253 1 FULL/BDR 00:00:34 172.20.161.2
Port-channel1.177
4006-CC2-L3#
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