[nsp] Virtual Access interface load sharing

[Steven Godfrey]

Hi,
I'm experiencing a problem with load sharing across multiple ADSL lines, I have exhausted all my ideas so if anyone can offer any
advice I would appreciate it.

The CPE load shares ok on the transmit of packets, this is configured on a per packet basis.

The return packets to the CPE are not load shared by the LNS-PE, this is also configured on a per packet basis.

The 213.146.135.185 is the connected PPP route, the address is either negotiated or unnumbered fa0/0 on the CPE.

This is the CEF entry for the PPP attached address:
213.146.135.185/32	attached	Virtual-Access6
			attached	Virtual-Access7

A /30 route is installed via the connected interface, this route is passed via RADIUS.

The routing table looks as follows:

Route to the remote subnet

UK-LN2-PE5-ADSL#sh ip route vrf INTERNET 213.146.135.184
Routing entry for 213.146.135.184/30
  Known via "static", distance 1, metric 0
  Redistributing via bgp 13009
  Advertised by bgp 13009
  Routing Descriptor Blocks:
  * 213.146.135.185
      Route metric is 0, traffic share count is 1

Route to 213.146.135.185

UK-LN2-PE5-ADSL#sh ip route vrf INTERNET 213.146.135.185
Routing entry for 213.146.135.185/32
  Known via "connected", distance 0, metric 0 (connected, via interface)
  Redistributing via bgp 13009
  Advertised by bgp 13009
  Routing Descriptor Blocks:
  * directly connected, via Virtual-Access7
      Route metric is 0, traffic share count is 1
    directly connected, via Virtual-Access6
      Route metric is 0, traffic share count is 1

The Cef entry on the PE looks strange for the routed subnet:

213.146.135.184/30	0.0.0.0	Virtual-Access6
			0.0.0.0	Virtual-Access7

The RADIUS user looks like this:

A-USER    Password = "XXXXXXX"
                Service-Type = Framed,
                Framed-Protocol = PPP,
                Framed-IP-Address = 213.146.135.185,
	    Cisco-AVPair = "ip:route=vrf INTERNET 213.146.135.184 255.255.255.252",
                Cisco-AVPair = "lcp:interface-config#2=ip vrf forwarding INTERNET\nip unnumbered loop213\nip load-sharing
per-packet"


The PE config looks like this:

The IOS ver on the PE is c7200-js-mz.122-4.B4.bin, I have tried c7200-js-mz.122-4.B7.bin in a similar setup in the lab.

UK-LN2-PE5-ADSL#sh run

ip vrf INTERNET
 rd 13009:10
 export map 10-INTERNET
 route-target export 13009:10
 route-target import 13009:10
 route-target import 13009:120
!
!
vpdn-group L2TP1
 accept-dialin
  protocol l2tp
  virtual-template 1
 terminate-from hostname ITO.L-CENTRAL1
!
tag-switching tdp router-id Loopback0
!
interface Loopback0
 ip address 10.0.2.42 255.255.255.255
!
interface Loopback213
 ip vrf forwarding INTERNET
 ip address x.x.x.x 255.255.255.255
!
interface Virtual-Template1
 ip unnumbered Loopback0
 load-interval 30
 no peer default ip address
 ppp authentication chap


The CPE configuration is as follows:

The IOS ver in the CPE is c1700-k8o3sv3y7-mz.122-11.T.bin

ip cef
prompt CPE
!
interface Loopback0
 ip address 1.2.3.5 255.255.255.255
!
interface ATM0/0
 no ip address
 no atm ilmi-keepalive
 pvc 0/38
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 !
 dsl operating-mode auto
 no fair-queue
!
interface FastEthernet0/0
 ip address 1.1.1.1 255.255.255.252
 ip load-sharing per-packet
 speed auto
!
interface ATM1/0
 no ip address
 no atm ilmi-keepalive
 pvc 0/38
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 !
 dsl operating-mode auto
 no fair-queue
!
interface Dialer0
 ip unnumbered FastEthernet0/0
 ip load-sharing per-packet
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 no cdp enable
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
no ip http server
!
dialer-list 1 protocol ip permit
!
call rsvp-sync
!
voice-port 2/0
!
voice-port 2/1
!
voice-port 3/0
!
voice-port 3/1
!
dial-peer cor custom
!
end

Thanks in advance....

Regards,

Steven Godfrey
Phone 01423 850007
steven.godfrey@intechnology.co.uk
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