First some background:
We've been running two ME3600X's (Version 12.2(52)EY3 - ancient I know)
in our network at opposite ends of a metro Ethernet circuit to allow us
to remap the provider's handoff VLAN tags to our own (when needed). We
use one of the VLANs as a connection directly between two routers
running OSPF. This worked for over a year with no special config outside
what was listed in the online configuration guide. Early last week,
however, the OSPF session dropped and wouldn't come back up. After some
research, it appears this is probably related to one of the several
known issues in the release guides (CSCtt03126) for multicast through
EFP's. Here are the relevant parts of the config (I think):
no ip igmp snooping vlan 47
vlan 47
name OSPF-BETWEEN-SITES
! Start Default small port buffer fix
class-map match-all COS_ZERO
match cos 0
policy-map QUEUEFIX
class COS_ZERO
bandwidth 100
queue-limit 3932 us
class class-default
queue-limit 3932 us
! End small port buffer fix
interface GigabitEthernet0/1
description Metro Ethernet Handoff
port-type nni
switchport trunk allowed vlan none
switchport mode trunk
spanning-tree portfast trunk
service instance 47 ethernet
encapsulation dot1q 47
rewrite ingress tag pop 1 symmetric
service-policy output QUEUEFIX
bridge-domain 47
I've got a temporary workaround in place (GRE tunnel to turn the
multicast into unicast directly between routers), but would like to get
back to a "normal" config. My questions are:
1. Would upgrading to the latest IOS for the switch likely resolve this
issue without further config modification? Any config issues likely to
be seen by going to that version?
2. I see in the release notes that there are a few likely workarounds
(again CSCtt03126) - Would MST (one of the suggested workarounds) on the
3600X play nicely with a directly connected C3750X in rapid-pvst mode?
3. What is the going recomendation for stable/fewest bugs/etc on the IOS
version? Latest and greatest?
Thanks in advance for any suggestions.
-Mike
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