Vlan1, as shown in the output below, is getting close to 1 Gbps and i'm worried that it will start to drop packets. I know that physical interfaces have a speed limit of 100 or 10000 but what is the limit of a virtual interface (vlan1)?
6509E_1#sh int vlan1
Vlan1 is up, line protocol is up
Hardware is EtherSVI, address is 001e.498f.3800 (bia 001e.498f.3800)
Internet address is 10.30.0.10/16
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 27/255, rxload 143/255
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 29w0d
Input queue: 0/75/319965/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 920757000 bits/sec, 100733 packets/sec
5 minute output rate 109690000 bits/sec, 69695 packets/sec
L2 Switched: ucast: 38127819259 pkt, 34815805864441 bytes - mcast: 211929687 pkt, 24160555629 bytes
L3 in Switched: ucast: 284774661762 pkt, 288770895469933 bytes - mcast: 0 pkt, 0 bytes mcast
L3 out Switched: ucast: 207676756187 pkt, 55103932658430 bytes mcast: 0 pkt, 0 bytes
284980720796 packets input, 288794501667563 bytes, 0 no buffer
Received 183946216 broadcasts (8820452 IP multicasts)
0 runts, 0 giants, 2552 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
207770123124 packets output, 55118868952804 bytes, 0 underruns
0 output errors, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
You can infer that the SVI rate is 1gig by looking to the bandwidth and delay vales, normally for 1gig interfaces you will see this:
Hope this helps.
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There shouldn't be any (by default) bandwidth limit on a VLAN interface.
A VLAN interface's in and out bandwidth would be the aggregate of all the interfaces (on same device) that are part of the VLAN.