[c-nsp] having a one-way vlan 1 stp issue....resolved....bug in 3750 ce1 ios, ugh
Aaron
aaron1 at gvtc.com
Thu Sep 6 13:24:01 EDT 2012
RESOLVED!
Cisco tac found a bug on my ce1 3750
Details...
tac case for tls test
sh int g0/0/0/9*
sh controllers np ports all
sh controllers np counters np1
(looked for UNKNOWN_L2_ON_L3_DISCARD)
proved that vlan 1 was arriving untagged by...
conf t
int g0/0/0/9.117
encap unta
commi
do sh int g0/0/0/9.117 and we saw packets come in and drop 1 for 1
then i disabled stp vl 1 on ce1 and saw that it was further proven that this
was infact untagged traffic coming from that ce1 3750 *untagged* EVEN THOUGH
I HAD "vlan dot1q tag native" globally config'd!!
cdp and vtp worked though even while stp in vlan 1 didn't.
tac said this is a bug with what i was running on ce1...
c3750-ipbase-mz.122-50.SE5.bin
i upgraded to same code on ce2... c3750-ipservicesk9-mz.122-50.SE3.bin
works fine now.
-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Aaron
Sent: Thursday, September 06, 2012 10:36 AM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] having a one-way vlan 1 stp issue....
Any idea why I can only see spanning tree for vlan 1 in *one direction* ?
all other vlan's stp work fine. AND if I flip the stp priority to prefer
root bridge placement on CE2 IT WORKS! See below. (also bidirectional
flows work for vlan 1 pings, vtp and cdp) ONLY STP VLAN 1 is broke in one
direction ...that's the only problem I'm seeing.
Aaron
(topology)
CE2 (3750) g1/0/1 trunk all-----------g0/23
(me3600)---mpls-----(asr9k)g0/0/0/9/.116----- trunk all g1/0/1 (3750) CE1
(configs)
----------------------
----- CE2
----------------------
ce2-realnoc#sh run in g1/0/1
interface GigabitEthernet1/0/1
switchport trunk encapsulation dot1q
switchport mode trunk
end
----------------------
---- PE (3600)
----------------------
noc-3600#sh run in g0/23
interface GigabitEthernet0/23
description c7 tls-test
switchport trunk allowed vlan none
switchport mode trunk
load-interval 30
service instance 1 ethernet
encapsulation dot1q 1-4094
l2protocol tunnel cdp stp vtp dtp pagp lldp lacp udld
xconnect 10.101.0.3 20000 encapsulation mpls
----------------------
----- PE (asr9k)
----------------------
RP/0/RSP0/CPU0:sv-b-9k#sh run l2vpn xconnect group tls-test
l2vpn
xconnect group tls-test
p2p tls-test
interface GigabitEthernet0/0/0/9.116
neighbor 10.101.12.253 pw-id 20000
----------------------
----- CE1
----------------------
ce1-top-crml#sh run in g1/0/1
interface GigabitEthernet1/0/1
switchport trunk encapsulation dot1q
switchport mode trunk
end
(what I'm seeing)
CE2 <<<----------- stp broke in this direction ONLY FOR VLAN 1 --------
CE1 (from ce1 to ce2)
Ce2 *doesn't* see vlan 1 config bpdu's carrying superior bridge prio of 8193
!!
ce2-realnoc#sh sp roo
Root Hello Max Fwd
Vlan Root ID Cost Time Age Dly Root Port
---------------- -------------------- --------- ----- --- --- ------------
VLAN0001 32769 68bc.0c61.3a80 0 2 20 15
VLAN0010 8202 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
VLAN0020 8212 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
VLAN0021 8213 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
VLAN0022 8214 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
VLAN0023 8215 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
VLAN0024 8216 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
VLAN0025 8217 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
VLAN0116 8308 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
ce1-top-crml#sh sp roo
Root Hello Max Fwd
Vlan Root ID Cost Time Age Dly Root Port
---------------- -------------------- --------- ----- --- --- ------------
VLAN0001 8193 68bc.0c61.2f80 0 2 20 15
VLAN0010 8202 68bc.0c61.2f80 0 2 20 15
VLAN0020 8212 68bc.0c61.2f80 0 2 20 15
VLAN0021 8213 68bc.0c61.2f80 0 2 20 15
VLAN0022 8214 68bc.0c61.2f80 0 2 20 15
VLAN0023 8215 68bc.0c61.2f80 0 2 20 15
VLAN0024 8216 68bc.0c61.2f80 0 2 20 15
VLAN0025 8217 68bc.0c61.2f80 0 2 20 15
VLAN0116 8308 68bc.0c61.2f80 0 2 20 15
----------------------------------------------------------------------------
-------------
CE2 ----------- stp works in this direction for vlan 1 -------->>> CE1
(from ce2 to ce1)
Ce1 *does* see vlan 1 config bpdu's carrying superior bridge prio of 4097
ce2-realnoc#conf t
ce2-realnoc(config)#spanning-tree vl 1 priority 4096 ce2-realnoc(config)#^Z
ce2-realnoc#sh sp roo *Mar 2 18:58:12.604: %SYS-5-CONFIG_I: Configured from
console by console
Root Hello Max Fwd
Vlan Root ID Cost Time Age Dly Root Port
---------------- -------------------- --------- ----- --- --- ------------
VLAN0001 4097 68bc.0c61.3a80 0 2 20 15
VLAN0010 8202 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
VLAN0020 8212 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
VLAN0021 8213 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
VLAN0022 8214 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
VLAN0023 8215 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
VLAN0024 8216 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
VLAN0025 8217 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
VLAN0116 8308 68bc.0c61.2f80 4 2 20 15 Gi1/0/1
ce2-realnoc#
ce1-top-crml#sh sp roo
Root Hello Max Fwd
Vlan Root ID Cost Time Age Dly Root Port
---------------- -------------------- --------- ----- --- --- ------------
VLAN0001 4097 68bc.0c61.3a80 4 2 20 15 Gi1/0/1
VLAN0010 8202 68bc.0c61.2f80 0 2 20 15
VLAN0020 8212 68bc.0c61.2f80 0 2 20 15
VLAN0021 8213 68bc.0c61.2f80 0 2 20 15
VLAN0022 8214 68bc.0c61.2f80 0 2 20 15
VLAN0023 8215 68bc.0c61.2f80 0 2 20 15
VLAN0024 8216 68bc.0c61.2f80 0 2 20 15
VLAN0025 8217 68bc.0c61.2f80 0 2 20 15
VLAN0116 8308 68bc.0c61.2f80 0 2 20 15
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