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Today's Topics:
1. Re: ND2 strange node behaviour (Mark Cooper)
2. IPv6 support in netdisco ? (Andrew Daviel)
--- Begin Message ---
Looks like normal Cisco behaviour I have seen on chassis based and fixed format
switches since 1999. I never got a good answer from Cisco when I used to ask
about it years ago. Good luck and please share the answer if you get a good
one. Would be nice to know.
Thanks,Mark Cooper
*Cooper's Communications*
[email protected]
> On 30/5/2014 1:44 μμ, Alan Buxey wrote:
>
> > That client device seems to be on the default native vlan. Not using
> > seperate vlan for devices and mgnt? It may very well be a case of cam
> > table exhaustion if it's one big flat l2 network. Check switch
> > resources and the SDM profile in use on the switch.
>
> Thank you Alan for your advice.
>
> Yes, we are not using a separate vlan for management. We have a
> relatively small network and we are far from table exhaustion. All
> switches are Layer 2. Routing is done by a Cisco 3825 with multiple
> interfaces.
>
> Some (attempted) troubleshooting -always for the same node:
>
> csw-astr0#sh clock
> 23:12:58.425 EET Fri May 30 2014
> csw-astr0#sh ip arp | incl 0004.0092.aa9d
> Internet 195.251.202.16 12 0004.0092.aa9d ARPA Vlan1
>
> So, the MAC address is in the arp table, but:
>
> csw-astr0#sh mac-address-table address 0004.0092.aa9d
> Mac Address Table
> -------------------------------------------
>
> Vlan Mac Address Type Ports
> ---- ----------- -------- -----
>
> ...it is not available in the mac-address-table. If we ping the
> associated IP address:
>
> csw-astr0#ping 195.251.202.16
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 195.251.202.16, timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/9 ms
>
> ...then the mac address shows up in the mac-address-table:
>
> csw-astr0#sh clock
> 23:13:26.603 EET Fri May 30 2014
> csw-astr0#sh mac-address-table address 0004.0092.aa9d
> Mac Address Table
> -------------------------------------------
>
> Vlan Mac Address Type Ports
> ---- ----------- -------- -----
> 1 0004.0092.aa9d DYNAMIC Fa0/3
> Total Mac Addresses for this criterion: 1
>
> ...but after a few seconds, it is no more available:
>
> csw-astr0#sh clock
> 23:13:45.167 EET Fri May 30 2014
> csw-astr0#sh mac-address-table address 0004.0092.aa9d
> Mac Address Table
> -------------------------------------------
>
> Vlan Mac Address Type Ports
> ---- ----------- -------- -----
>
> Yet, there is no problem with table space:
>
> csw-astr0#sh mac-address-table count
>
> Mac Entries for Vlan 1:
> ---------------------------
> Dynamic Address Count : 26
> Static Address Count : 0
> Total Mac Addresses : 26
>
> Mac Entries for Vlan 100:
> ---------------------------
> Dynamic Address Count : 4
> Static Address Count : 0
> Total Mac Addresses : 4
>
> Total Mac Address Space Available: 7418
>
> Also:
>
> csw-astr0#show sdm prefer
> The current template is "default" template.
> The selected template optimizes the resources in
> the switch to support this level of features for
> 0 routed interfaces and 255 VLANs.
>
> number of unicast mac addresses: 8K
> number of IPv4 IGMP groups: 0.25K
> number of IPv4/MAC qos aces: 0
> number of IPv4/MAC security aces: 0.25K
>
> Indeed, if I do a "ping 195.251.202.16" (either on the switch or from
> another box) and then I IMMEDIATELY force a macsuck in ND2, then the
> node (since it has been included for a short while -a few seconds- in
> the MAC table) appears in ND2.
>
> But why the particular MAC address is getting removed from the
> MAC-Address-table so quickly? Any ideas will be appreciated!
>
> Thanks,
> Nick
>
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>
--- End Message ---
--- Begin Message ---
I see on the website that IPv6 is "supported" in netdisco since version
1.1 or so.
How do I actually find IPv6 information ?
I just installed netdisco 2. I was hoping to find some Scope:Link
information (fe80:: addresses) being used on our network, but I can't find
anything - while Linux computers generate an address based on MAC address,
and I can find that in netdisco, others e.g. Windows generate random
addresses).
We have a Juniper EX8000 series router and Avaya switches. We don't have
any global IPv6 outing configured yet, but we have been getting Scope:Link
traffic including a flood from some broken Intel drivers.
--
Andrew Daviel, TRIUMF, Canada
Tel. +1 (604) 222-7376 (Pacific Time)
--- End Message ---
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