Package: lldpd
Version: 0.4.0-2
Severity: normal
I'm running lldpd on a machine whose main network interface looks like:
eth0 Link encap:Ethernet HWaddr 00:c0:4f:68:12:cb
inet addr:131.111.11.78 Bcast:131.111.255.255 Mask:255.255.0.0
inet6 addr: fe80::2c0:4fff:fe68:12cb/64 Scope:Link
inet6 addr: 2001:630:200:8100:2c0:4fff:fe68:12cb/64 Scope:Global
IPX/Ethernet 802.3 addr:836F0A00:00C04F6812CB
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:79429040 errors:0 dropped:0 overruns:281 frame:0
TX packets:8684282 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3362518813 (3.1 GiB) TX bytes:3142623466 (2.9 GiB)
Interrupt:17
According to Wireshark, the LLDPDUs transmitted by lldpd include a
"Maximum Frame Size" TLV indicating a frame size of 1500 octets. This is
incorrect: According to IEEE Std 802.1AB-2005 (clause G.5.1):
# a) If the MAC/PHY supports only the basic MAC frame format as defined in
# 3.1.1 of IEEE Std 802.3-2002, the maximum frame size field shall be
# set to 1518.
#
# b) If the MAC/PHY supports an extension of the basic MAC frame format
# for Tagged MAC frames as defined 3.5 of IEEE 802.3-2002, the maximum
# frame size field shall be set to 1522.
#
# c) If the MAC/PHY supports an extension of the MAC frame format that is
# different from either of the above, the maximum frame size field
# shall be set to the maximum value supported.
Thus, lldpd should set this field to 1518, 1522, or some other number
depending on the network driver's support for tagged VLANs and jumbo
frames. 1500 is definitely wrong, and it would be better for lldpd not to
include this TLV at all than to transmit incorrect information.
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.27.9 (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/bash
Versions of packages lldpd depends on:
ii adduser 3.111 add and remove users and groups
ii libc6 2.10.1-7 GNU C Library: Shared libraries
ii libsnmp15 5.4.1~dfsg-12 SNMP (Simple Network Management Pr
lldpd recommends no packages.
Versions of packages lldpd suggests:
pn snmpd <none> (no description available)
-- no debconf information
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