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DECbridge 500 Operational Firmware V3.0
Release Notes
This release of DECbridge 500 Firmware contains the following
functionality which is new from V2.2.
1. The capability to manage the DECbridge 500 with SNMP has been
added in this version. SNMP Get Requests are supported,
through the community "public". The SNMP Cold Trap is sent
to the community "traps", to Trap addresses configured via
ELMS, if any.
2. MIBs supported - The MIBs implemented are MIB-II as per RFC
1213, DEC Vendor MIB ELANEXT v1.3, the experimental draft
IETF FDDI MIB v0.6, Nov 1990, and the experimental draft IETF
Bridge MIB D6, February 1991. The DEC Vendor MIB ELANEXT
v1.3 can be accessed at gatekeeper.dec.com via anonymous ftp,
in the /private/mib directory. Please retrieve the README
file for MIB information.
3. The IP support stack has been incorporated to support SNMP.
Protocols implemented are IP, ARP, UDP, and ICMP. BOOTP has
been implemented to allow the DECbridge 500 to get its IP
address, unless the device is already configured with one
permanently via ELMS.
4. ELMS supports sets and removals for IP address, Gateway
address and Trap Addresses. Setting the IP address or
Gateway address to 0.0.0.0 is equivalent to removing the
corresponding address.
5. ELMS supports adds and removals of Ethernet protocol types to
the Non Translated Protocol (NTP) table. This feature is
provided mainly to alleviate problems in a transparently
bridged FDDI/NI extended LAN where the AppleTalk Phase 2
protocol is in use. Packets with protocol type present in
the NTP table will be translated to the form they were
received in, even if the packet was transmitted by a station
in RFC 1042 format, across a pair of DECbridge 500's. The
NTP table contains the Apple ARP Protocol type (80-F3) as a
factory set default which allows both AppleTalk 1 and 2 to
work across a pair of DECbridge 500's. The following
commands are available through DECelms to manage the NTP
table :
- Add an ethernet protocol type to the NTP table.
ELMS> add bridge1 ntp 90-08 password secret
- Remove an entry from the NTP table.
ELMS> remove bridge1 ntp 90-08 password secret
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- Show entries in the NTP table
ELMS> show bridge1 ntp
6. 802.3 Length - If the 802.3 Length field is smaller than the
received packet size indicates it should be, the packet will
be translated into a packet with the appropriate length as
indicated by the 802.3 Length field. In this case, if the
received packet on the 802.3 network is not a minimum size
packet, the NI Length error counter on the 802.3 port will be
incremented.
The following bugs were fixed from V2.2.
1. IP Length - If a large IP packet is received on the FDDI and
it is to be fragmented, and the total length field in the IP
header indicates less data than the size of the received
packet (ie, there was padding), then the padding will be
removed during fragmentation. Previously, such packets were
discarded.
The following are warnings for the network manager to be aware of
after installing DECbridge 500 Firmware V3.0.
1. The DECbridge 500 should be configured with an IP address
either with the use of ELMS, or by setting up the hardware
address of the unit with an IP address in a BOOTP server on
the network. Note that the device will periodically try to
get its IP address approximately every 1 minute using BOOTP
until it is configured with an IP address.
2. If you use Appletalk Phase 2 and have upgraded your DECbridge
500 units to Firmware V3.0 follow one of the steps given
below to ensure the presence of the Apple ARP protocol value
in the NTP table.
- Use DECelms to reset the bridge with the factory set
defaults.
ELMS> init bridge1 with defaults password secret
- If the bridge already contains management created
address/protocol filters or other parameters whose
default values were changed through management, then the
previous step would destroy these changes. In order to
avoid this the following command can be given on DECelms
to add Apple ARP in the NTP table.
ELMS> add bridge1 ntp 80-f3 password secret
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