Dean, Probably good to move this over to cisco-nsp@puck.nether.net and answer the questions below over there. What code is it? Looks like a bug where the IDB counters are not being bumped on the SVI. Is it L3 switching traffic through the SVI or L2 (intra vlan traffic between L2 ports)? Rodney On 5/26/10 4:17 AM, Dean Belev wrote:
Hi all,
Another strange Cisco behavior - or may be unknown one. Creating SVI interface with a lot of traffic passing through - nothing suspicious. Until ...
/7606#sh int vlan XXX Vlan537 is up, line protocol is up Hardware is EtherSVI, address is MAC (bia 001c.b0b7.6400) Description: 0449-070C001#NetLan_Int Internet address is IP/30 MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, reliability 255/255, txload 1/255, rxload 0/255 Encapsulation ARPA, loopback not set Keepalive not supported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:00, output 00:00:00, output hang never Last clearing of "show interface" counters 00:08:18 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) *30 second input rate 0 bits/sec, 0 packets/sec 30 second output rate 0 bits/sec, 0 packets/sec* L2 Switched: ucast: 25025 pkt, 2426613 bytes - mcast: 0 pkt, 0 bytes L3 in Switched: ucast: 3597038 pkt, 3755053095 bytes - mcast: 0 pkt, 0 bytes mcast L3 out Switched: ucast: 2000511 pkt, 602156179 bytes mcast: 0 pkt, 0 bytes 3678505 packets input, 3803335802 bytes, 0 no buffer Received 0 broadcasts (0 IP multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 1899084 packets output, 568639522 bytes, 0 underruns 0 output errors, 0 interface resets 0 unknown protocol drops 0 output buffer failures, 0 output buffers swapped out/ #### 7606#sh int vlan XXX summary
*: interface is up IHQ: pkts in input hold queue IQD: pkts dropped from input queue OHQ: pkts in output hold queue OQD: pkts dropped from output queue RXBS: rx rate (bits/sec) RXPS: rx rate (pkts/sec) TXBS: tx rate (bits/sec) TXPS: tx rate (pkts/sec) TRTL: throttle count
Interface IHQ IQD OHQ OQD RXBS RXPS TXBS TXPS TRTL --------------------------------------------------------------------------------------------------------
*VlanXXX 0 0 0 0 *0 0 0 0 * 0 #######
All counters but RXBS/RXPS/TXBS/TXPS showing there is a traffic (~400 Mbps). Also visible using MIB values. But the SVI bits/packets not showing it. There are 146 SVIs configured there (we have another Cisco 7609 RSP720 with 393 ones and no such a problem present). We deleted around 10 interfaces trying to release any resources - without result, delete/create the interface - the same.
Is there any limit I do not know. I tried to read about any limits of the number of SVIs - no result. Are there any assumptions?
Thank you in advance!
Best~
/Dean Belev Network Management Team Neterra Ltd. Sofia, Bulgaria Phone: +359 2 974 33 11 Fax: +359 2 975 34 36 Mobile: +359 886 663 123 http://www.neterra.net/