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New Member

Tunnel through HSSI interface going very slow

After some tests, we can conclude that traffic through tunnel, if it goes through the HSSI interface, is very slow, down to 100-200 kbps, but if it goes through the FastEthernet, on the same router, it easily reaches 2Mbps. Did anybody have similar experience?

What should we looking for, how can we troubleshoot this. HSSI interface is ok, traffic outside of the tunnel goes up to 30-40 Mbps.

Any help, ideas, directions appreciated,

Dardan

4 REPLIES

Re: Tunnel through HSSI interface going very slow

Hi

Can you revert what kinda tunnel you are using over there ? is it a GRE or a IPSEC tunnel ?

Is it possible to post out the configs related to the particular interace from both the routers ??

regds

New Member

Re: Tunnel through HSSI interface going very slow

It's GRE. this are the configs of the tunnel and hssi interfaces:

interface Tunnel0

description GRE-tunnel0-2

bandwidth 34816

ip address a.b.c.d 255.255.255.252

ip tcp adjust-mss 1436

load-interval 30

keepalive 10 3

tunnel source Loopback5

tunnel destination e.f.g.h

hold-queue 4096 in

hold-queue 4096 out

end

interface Hssi4/0

dampening 30 1000 2000 60

description p2p

bandwidth 34816

ip address i.j.k.l 255.255.255.252

ip access-group egress in

no ip unreachables

no ip proxy-arp

encapsulation ppp

ip route-cache flow

load-interval 30

no peer neighbor-route

hssi external-loopback-request

serial restart-delay 0

no cdp enable

end

These are the resluts from show interface commands:

R1#show interfaces tunnel 0

Tunnel0 is up, line protocol is up

Hardware is Tunnel

Description: GRE-tunnel0-2

Internet address is a.b.c.d/30

MTU 1514 bytes, BW 34816 Kbit, DLY 500000 usec,

reliability 255/255, txload 4/255, rxload 3/255

Encapsulation TUNNEL, loopback not set

Keepalive set (10 sec), retries 3

Tunnel source 1.2.3.4 (Loopback5), destination e.f.g.h

Tunnel protocol/transport GRE/IP, key disabled, sequencing disabled

Tunnel TTL 255

Checksumming of packets disabled, fast tunneling enabled

Tunnel transmit bandwidth 8000 (kbps)

Tunnel receive bandwidth 8000 (kbps)

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

Last clearing of "show interface" counters never

Input queue: 0/4096/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/4096 (size/max)

30 second input rate 486000 bits/sec, 117 packets/sec

30 second output rate 585000 bits/sec, 120 packets/sec

9782494 packets input, 488630909 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

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

18012002 packets output, 1635080853 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

R1#show interfaces hssi 4/0

Hssi4/0 is up, line protocol is up

Hardware is M1T-HSSI-B

Description: p2p

Internet address is i.j.k.l/30

MTU 4470 bytes, BW 34816 Kbit, DLY 200 usec,

reliability 255/255, txload 31/255, rxload 126/255

Encapsulation PPP, LCP Open

Open: IPCP, crc 16, loopback not set

Keepalive set (10 sec)

Restart-Delay is 0 secs

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

Last clearing of "show interface" counters 2d10h

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 3338

Queueing strategy: fifo

Output queue: 0/40 (size/max)

30 second input rate 17318000 bits/sec, 3136 packets/sec

30 second output rate 4283000 bits/sec, 2797 packets/sec

281998575 packets input, 95062960 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 parity

275 input errors, 254 CRC, 0 frame, 16 overrun, 0 ignored, 5 abort

508278019 packets output, 2316043821 bytes, 0 underruns

0 output errors, 0 applique, 1 interface resets

0 output buffer failures, 0 output buffers swapped out

2 carrier transitions LC=down CA=up TM=down LB=down TA=up LA=down

It's the same router. If we do a tunnel "over" hssi interface throughput goes only up to 200-400 kbps. If we do it "over" the Fast Ethernet interface from one PC we can get 2Mbps with no problems.

Other indications are that through tunnel over hssi we can not open certain sites, like hotmail etc. Cisco site works just fine, although we can not watch the videos, we presume because of the low throughput.

thanks

Silver

Re: Tunnel through HSSI interface going very slow

Just wonder if MSS or MTU could be the issue for this. Can you change the MSS globally and check if the issue is resolved and also if the existing link is working fine

Re: Tunnel through HSSI interface going very slow

Hi

In addition to gautams comment would suggest to make the MTU on the tunnel interface as 1500 .

I couldnt see anything inline with MTU there in the tunnel interface..

Also refer this link which deals about the same kinda problem ..

http://www.cisco.com/en/US/tech/tk827/tk369/technologies_tech_note09186a0080093f1f.shtml

regds

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