cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements

261
Views
0
Helpful
0
Replies
Highlighted
Beginner

C4948E-S - Really slow performance IP routing

Hello,

I have a C4948E-S switch, on 12.2(54)SG1.

I have two VLANs (5,10)...

192.168.5.0/24

192.168.10/24

I've enabled IP routing, ip cef is on by default, also enabled ip multicast routing. With both machines HOST A connected on VLAN 5 and HOST B pointing to the relevent gateway (switches VLAN interface IP)... I have perfect connectivity.

However, when using iperf, if I connect both hosts to the same VLAN I get:

987 MBytes   857 Mbits/sec

However, if they are on seperate VLANs I get the following:

118 MBytes  98.9 Mbits/sec

I also have a 3560X and this performs fine, so there is something wrong with the 4948E... can anyone advise if they have seen this before and what I should do?

Here are some interface diags:

Vlan5 is up, line protocol is up

  Hardware is Ethernet SVI, address is

  Description: VLAN FIVE

  Internet address is 192.168.5.1/24

  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive not supported

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, output never, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

  L3 in Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes

  L3 out Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes

  IPv6 L3 in Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes

  IPv6 L3 out Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes

     820 packets input, 75521 bytes, 0 no buffer

     Received 1211 broadcasts (122 IP multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     9512 packets output, 1017536 bytes, 0 underruns

     0 output errors, 0 interface resets

     0 output buffer failures, 0 output buffers swapped out

Many thanks.

CreatePlease to create content
Content for Community-Ad
July's Community Spotlight Awards