[f-nsp] Answer of the given problem as similar situation is faced

[irfan afridi]

m running a pair of ServerIron chassis, and a FastIron II+ and 800. Each FI
has several VLANs on it. STP is enabled and part of the network forms a
loop with the STP weights adjusted so that the trunk between the FI800 and
FI2p on VLAN 10 only comes up during a failure (reliability issues with the
SIs prompted this). The ServerIrons each connect to VLAN 10 on each
FastIron and connect again to VLAN 165 on the same switch. Each FI is
running multiple instances of spanning tree - each SI is running a single
instance. This is the logical layout: ISP / \ FI800 -- FI2p | | vlan 10 SI1
S12 ~~~~~~~~ | | vlan 165 FI800 -- FI2p | | hosts hosts The first strange
thing I notice is that both VLAN 1 (one) and VLAN 165 share the same bridge
address (each FI is different from the other though). Is this normal? The
second, and more important issue, is that last week, there was an outage
lasting several hours. It all started after a STP TC was executed. No
changes were made to the network to prompt that and it happened after this
configuration was running for several months. In my haste to correct the
problem, I didn't take accurate notes, and my memory is hazy. But at one
point, I powered one of the ServerIrons off. Then, I noticed that the other
SI's ports were BLOCKING. Rebooting the switches didn't help, I was only
able to recover by disabling and reenabling STP on the switches. I know the
details are sparse so I don't expect much in the way of help, however, I
was told by someone that they experienced a similar problem before when
connecting a ServerIron to the same FastIron twice, on different VLANS --
something to do with the STP BPDUs being received by the same physical
switch twice caused problems. I can't figure out what prompted the TC, nor
why the switches stopped forwarding traffic after that. I don't recall
which ports were BLOCKING, if any, initially after the problem started.
Later, even after one of the SIs was powered off, thereby removing any
physical loop in the network, certain interfaces were still BLOCKING. I'm
sure my understanding of this is flawed and any advice or recommendation
based on such a bad description would be greatly appreciated! Thanks, Pat
PS I've attached the logs during the first hour of the problem and a
snippet of show span from FI800: Global STP (IEEE 802.1D) Parameters: VLAN
Root Root Root Prio Max He- Ho- Fwd Last Chg Bridge ID ID Cost Port rity
Age llo ld dly Chang cnt Address Hex sec sec sec sec sec 1 800000e052d5c800
0 Root 8000 20 2 1 15 676420 0 00e052d5c800 VLAN Root Root Root Prio Max
He- Ho- Fwd Last Chg Bridge ID ID Cost Port rity Age llo ld dly Chang cnt
Address Hex sec sec sec sec sec 165 800000048071ef00 4 3/7 8000 20 2 1 15
674707 2 00e052d5c800 VLAN Root Root Root Prio Max He- Ho- Fwd Last Chg
Bridge ID ID Cost Port rity Age llo ld dly Chang cnt Address Hex sec sec
sec sec sec 10 800000048071ef00 12 1/3 8000 20 2 1 15 674817 5 00e052d5c802
Mar 20 16:21:27 SIGT1, L4 server eisweb7 is down Mar 20 16:21:27 SIGT1, L4
server eisweb7 port 80 is down due to server-down Mar 20 16:21:28 SIGT1, L4
server eisweb3 is down Mar 20 16:21:28 SIGT1, L4 server eisweb3 port 80 is
down due to server-down Mar 20 16:21:28 SIGT1, L4 server eisweb4 is down
Mar 20 16:21:28 SIGT1, L4 server eisweb4 port 80 is down due to server-down
Mar 20 16:21:28 SIGT1, L4 server eisweb5 is down Mar 20 16:21:28 SIGT1, L4
server eisweb5 port 80 is down due to server-down Mar 20 16:21:28 SIGT1, L4
server eisweb6 is down Mar 20 16:21:28 SIGT1, L4 server eisweb6 port 80 is
down due to server-down Mar 20 16:21:28 SIGT1, L4 server eisweb port 80 is
down. SERVICE DOWN Mar 20 16:21:32 FastIronIIPlus, VLAN 165 Bridge is
RootBridge: 800000e052d5c846 (MsgAgeExpiry) Mar 20 16:21:34 FastIron800,
VLAN 165 Bridge is RootBridge: 800000048071ef26 (MsgAgeExpiry) Mar 20
16:21:34 FastIronIIPlus, VLAN 165 New RootBridge: 800000048071ef26
RootPort: 3/7 (BpduR cvd) Mar 20 16:21:34 SIGT1, VLAN 1 Bridge is
RootBridge: 8000000cdb5d3920 (MsgAgeExpiry) Mar 20 16:33:16 FastIronIIPlus,
NTP server 130.126.24.24 failed to respond Mar 20 16:33:31 FastIronIIPlus,
NTP server 130.126.24.44 failed to respond Mar 20 17:03:16 FastIronIIPlus,
NTP server 130.126.24.24 failed to respond Mar 20 17:03:31 FastIronIIPlus,
NTP server 130.126.24.44 failed to respond Mar 20 17:22:55 FastIronIIPlus,
Interface ethernet 3/7, state down Mar 20 17:22:55 FastIronIIPlus, VLAN 10
Bridge is RootBridge: 800000e052d5c807 (PortDown) Mar 20 17:22:55
FastIronIIPlus, VLAN 165 Bridge is RootBridge: 800000e052d5c846 (PortDown)
Mar 20 17:22:55 FastIronIIPlus, Interface ethernet 3/8, state down Mar 20
17:22:59 FastIronIIPlus, VLAN 10 Port 3/7 STP State -> LISTENING
(MakeFwding) Mar 20 17:22:59 FastIronIIPlus, VLAN 165 Port 3/7 STP State ->
LISTENING (MakeFwding) Mar 20 17:22:59 FastIronIIPlus, Interface ethernet
3/7, state up Mar 20 17:22:59 FastIronIIPlus, Interface ethernet 3/8, state
up Mar 20 17:23:14 FastIronIIPlus, VLAN 165 Port 3/7 STP State -> LEARNING
(FwdDlyExpiry) Mar 20 17:23:14 FastIronIIPlus, VLAN 10 Port 3/7 STP State
-> LEARNING (FwdDlyExpiry) Mar 20 17:23:19 FastIronIIPlus, Interface
ethernet 3/7, state down Mar 20 17:23:19 FastIronIIPlus, VLAN 10 Port 3/7
STP State -> DISABLED (PortDown) Mar 20 17:23:19 FastIronIIPlus, VLAN 165
Port 3/7 STP State -> DISABLED (PortDown) Mar 20 17:23:19 FastIronIIPlus,
Interface ethernet 3/8, state down Mar 20 17:23:25 FastIronIIPlus, VLAN 10
Port 3/7 STP State -> LISTENING (MakeFwding) Mar 20 17:23:25
FastIronIIPlus, VLAN 165 Port 3/7 STP State -> LISTENING (MakeFwding) Mar
20 17:23:25 FastIronIIPlus, Interface ethernet 3/7, state up Mar 20
17:23:25 FastIronIIPlus, Interface ethernet 3/8, state up Mar 20 17:23:32
FastIronIIPlus, VLAN 165 New RootBridge: 800000048071ef26 RootPort: 3/7
(BpduR cvd) Mar 20 17:23:32 FastIronIIPlus, VLAN 10 New RootBridge:
800000048071ef26 RootPort: 3/7 (BpduRc vd) Mar 20 17:23:40 FastIronIIPlus,
VLAN 10 Port 3/7 STP State -> LEARNING (FwdDlyExpiry) Mar 20 17:23:40
FastIronIIPlus, VLAN 165 Port 3/7 STP State -> LEARNING (FwdDlyExpiry) Mar
20 17:23:55 FastIronIIPlus, VLAN 10 Port 3/7 STP State -> FORWARDING
(FwdDlyExpiry) Mar 20 17:23:55 FastIronIIPlus, VLAN 10 Port 3/7 Bridge TC
Event (FwdDlyExpiry) Mar 20 17:23:55 FastIronIIPlus, VLAN 165 Port 3/7 STP
State -> FORWARDING (FwdDlyExpiry) Mar 20 17:23:55 FastIronIIPlus, VLAN 165
Port 3/7 Bridge TC Event (FwdDlyExpiry)
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