Hi,
I have two Cisco 6509 chassis running IOS version 12.2(17a)SX1 each with a Sup 720 and a 4 port 10-Gigabit Ethernet module:
6500-1#show mod Mod Ports Card Type Model--- ----- -------------------------------------- ------------------ 1 16 SFM-capable 16 port 1000mb GBIC WS-X6516-GBIC 2 4 CEF720 4 port 10-Gigabit Ethernet WS-X6704-10GE 3 48 SFM-capable 48-port 10/100 Mbps RJ45 WS-X6548-RJ-45 5 2 Supervisor Engine 720 (Active) WS-SUP720-BASE 6 16 SFM-capable 16 port 10/100/1000mb RJ45 WS-X6516-GE-TX
Mod Hw Fw Sw
--- ------ ------------ ------------ 1 2.0 6.1(3) 8.2(0.56)TET 2 1.3 12.2(14r)S5 12.2(17a)SX1 3 1.1 6.3(1) 8.2(0.56)TET 5 3.1 7.7(1) 12.2(17a)SX1 6 2.6 6.3(1) 8.2(0.56)TET
Mod Sub-Module Model Serial Hw
--- --------------------------- ------------------ ------------ ------- 2 Centralized Forwarding Card WS-F6700-CFC SAD074701VB 1.2 5 Policy Feature Card 3 WS-F6K-PFC3A SAD08030CFA 2.1 5 MSFC3 Daughterboard WS-SUP720 SAD08030C29 2.1
6500-1#show run int t2/1 Building configuration...Current configuration : 226 bytes ! interface TenGigabitEthernet2/1 description Link to other office no ip address udld port aggressive mls qos trust dscp switchport switchport trunk encapsulation dot1q switchport mode trunk switchport nonegotiate end
They are connected to each other using a TenGigabit Ethernet port over single mode dark fibre. The fibre run is a couple of miles long and supplied by a local telco. Only one of the 10Gb interfaces is being used on each switch.
The 10Gb interfaces on each end of this link are reporting a large number of giants when I do a show int (when I looked the other day it appeared to be around 150Mb/sec, right now, late on a Saturday night it's around 4Mb/sec). They are the only interfaces that are reporting giants.
If I look at the interfaces with SNMP I see no errors or discards.
6500-1#show int t2/1 TenGigabitEthernet2/1 is up, line protocol is up (connected) Hardware is C6k 10000Mb 802.3, address is xxxx.xxxx.xxxx (bia xxxx.xxxx.xxxx) Description: Link to other office MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Full-duplex, 10Gb/s input flow-control is off, output flow-control is on ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:41, output 00:00:57, output hang never Last clearing of "show interface" counters never Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 154000 bits/sec, 122 packets/sec 5 minute output rate 770000 bits/sec, 492 packets/sec 16609486843 packets input, 7935718529298 bytes, 0 no buffer Received 175730057 broadcasts, 0 runts, 3545951873 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 input packets with dribble condition detected 22436196006 packets output, 17205205668690 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped outSo, are these giants anything to be concerned about or are they just a red herring and any idea why I only see them on the ten Gigabyte interfaces?