Latest revision as of 13:33, 10 June 2015

Introduction

Route-maps are often used with Routing Protocols such as BGP and use Prefix-lists

Enabling PBR on 3560 Switch platform

On the 3560 Switch platform you get the message %PLATFORM_PBR-4-SDM_MISMATCH: PBR requires sdm template routing when you apply a route-map to a Interface.

Remember: Use terminal monitor if you are not on the console to receive messages from the console.

This is because the SDM (Switch Database Management) template. The SDM manages the layer 2 and layer 3 switching information that is maintained in the Ternary Content Addressable Memory (TCAM). The TCAM is used for forwarding lookups. See ^[1]. There are some unsupported commands on IOS 12.2-25^[2]

CEF uses default Source/Destination load sharing, ensuring same path for the packetstreams.^[3]

Looking at the default configuration the switch had the following SDM configuration.

Core2#<input>sh sdm prefer</input>
 The current template is "desktop default" template.
 The selected template optimizes the resources in
 the switch to support this level of features for
 8 routed interfaces and 1024 VLANs.

  number of unicast mac addresses:                  6K
  number of IPv4 IGMP groups + multicast routes:    1K
  number of IPv4 unicast routes:                    8K
    number of directly-connected IPv4 hosts:        6K
    number of indirect IPv4 routes:                 2K
  number of IPv4 policy based routing aces:         <notice>0</notice>
  number of IPv4/MAC qos aces:                      512
  number of IPv4/MAC security aces:                 1K

Changing SDM Bias

Core2(config)#<input>sdm prefer routing</input>
Changes to the running SDM preferences have been stored, but cannot take effect
until the next reload.
Use 'show sdm prefer' to see what SDM preference is currently active.
Core2(config)#<input>^Z</input>
Core2#
1d00h: %SYS-5-CONFIG_I: Configured from console by vty0 (10.0.0.30)
Core2#<input>reload</input>

After reboot

Core2#<input>sh sdm prefer</input>
 The current template is "desktop routing" template.
 The selected template optimizes the resources in
 the switch to support this level of features for
 8 routed interfaces and 1024 VLANs.

  number of unicast mac addresses:                  3K
  number of IPv4 IGMP groups + multicast routes:    1K
  number of IPv4 unicast routes:                    11K
    number of directly-connected IPv4 hosts:        3K
    number of indirect IPv4 routes:                 8K
  number of IPv4 policy based routing aces:         <notice>512</notice>
  number of IPv4/MAC qos aces:                      512
  number of IPv4/MAC security aces:                 1K

Example

Lots of limitations on 3560 platform. Default route to 192.168.1.0/24 to 10.0.0.30 gateway all other to 10.0.0.34 gateway

ip access-list extended ISP-CON1
 remark Internally used nets denied. They should be routed by the FIB
 deny   ip 192.168.1.0 0.0.0.255 10.0.0.0 0.255.255.255
 deny   ip 192.168.1.0 0.0.0.255 192.168.0.0 0.127.255.255
 permit ip 192.168.1.0 0.0.0.255 any
!
ip prefix-list DEFAULT seq 5 permit 0.0.0.0/0
!
route-map HETH permit 5
 match ip address ISP-CON1
 set ip next-hop 10.0.0.30
!
route-map HETH permit 10
 match ip address prefix-list DEFAULT
 set ip next-hop 10.0.0.34

Example 2

interface Vlan28
 description TKUVLAN_308
 ip address 192.168.146.1 255.255.255.0
 ip helper-address 172.16.4.77
 ip helper-address 172.16.4.66
 ip pim sparse-mode
 ip policy route-map EX308
 ip igmp query-interval 125
!
ip access-list extended R308
 permit ip 192.168.146.0 0.0.0.255 any
!
route-map EX308 permit 10
 match ip address R308
 set ip next-hop 172.16.4.16

Links

References

[1] *3560 Configuring SDM Templates

[2] ttp://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_25_see/configuration/guide/swuncli.html

[3] ttp://www.cisco.com/en/US/docs/ios/12_2/switch/configuration/guide/xcfcefc.html

[1]

[2]

[3]

@@ Line 1: / Line 1: @@
+__TOC__
 [[Policy-Based Routing]] or [[PBR]] with Cisco IOS.
+= Introduction =
+Route-maps are often used with Routing Protocols such as [[BGP]] and use [[Prefix-list Cisco IOS|Prefix-lists]]
 == Enabling PBR on 3560 Switch platform ==
 On the 3560 Switch platform you get the message '''%PLATFORM_PBR-4-SDM_MISMATCH: PBR requires sdm template routing''' when you apply a route-map to a Interface.
+*'''Remember:''' Use ''terminal monitor'' if you are not on the ''console'' to receive messages from the console.
 This is because the '''SDM''' (Switch Database Management) template. The SDM manages the layer 2 and layer 3 switching information that is maintained in the Ternary Content Addressable Memory ([[Cisco TCAM|TCAM]]). The [[Cisco TCAM|TCAM]] is used for forwarding lookups. See <ref>*[http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_25_se/configuration/guide/swsdm.html 3560 Configuring SDM Templates]</ref>. There are some unsupported commands on IOS 12.2-25<ref>http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_25_see/configuration/guide/swuncli.html</ref>
@@ Line 53: / Line 57: @@
    number of IPv4/MAC security aces:                 1K
 </source>
 == Example ==
 Lots of limitations on 3560 platform. Default route to 192.168.1.0/24 to 10.0.0.30 gateway all other to 10.0.0.34 gateway
@@ Line 71: / Line 76: @@
   match ip address prefix-list DEFAULT
   set ip next-hop 10.0.0.34
+</source>
+==Example 2==
+<source lang=cli>
+interface Vlan28
+ description TKUVLAN_308
+ ip address 192.168.146.1 255.255.255.0
+ ip helper-address 172.16.4.77
+ ip helper-address 172.16.4.66
+ ip pim sparse-mode
+ ip policy route-map EX308
+ ip igmp query-interval 125
+!
+ip access-list extended R308
+ permit ip 192.168.146.0 0.0.0.255 any
+!
+route-map EX308 permit 10
+ match ip address R308
+ set ip next-hop 172.16.4.16
 </source>
 = Links =
 *[http://www.cisco.com/en/US/tech/tk364/technologies_configuration_example09186a00801f3b54.shtml Cisco Policy-Based Routing Using the set ip default next-hop and set ip next-hop Commands Configuration Example]
+* [http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009481d.shtml Cisco Understanding Policy Routing]
 =References=
 <references/>
-{{#css:
+{{Source cli}}
-    pre {   font-family: Lucida Console; font-weight: bold; font-size: 14px; color: #00FF00; background: black; margin: 10px 50px; width: 800px; line-height: 200%; overflow: auto;}
-}}
 [[category:Cisco]][[Category:CCNP3]]

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