nanog mailing list archives
Re: Failover how much complexity will it add?
From: Seth Mattinen <sethm () rollernet us>
Date: Mon, 09 Nov 2009 09:23:41 -0800
adel () baklawasecrets com wrote:
Actually thinking about this, I still need to understand the implications of not taking a full routing table to my setup. So what is the likely impact going to be if I take partial instead of full routing table. Would appreciate any feedback on this. My organisation is only looking at using BGP as a means of failover between two separate upstream ISPs. We are not an ISP.
Some Cisco L3 switches should support this fine. A 3560 or 3750 can speak BGP and route at line rate as long as your total number of routes will fit in its TCAM space. Ask your upstreams how big a partial feed from them 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: 0.5K number of IPv4/MAC qos aces: 0.5K number of IPv4/MAC security aces: 1K If you ever need IPv6 it gets smaller: number of unicast mac addresses: 2K number of IPv4 IGMP groups + multicast routes: 1K number of IPv4 unicast routes: 3K number of directly-connected IPv4 hosts: 2K number of indirect IPv4 routes: 1K number of IPv6 multicast groups: 1.125k number of directly-connected IPv6 addresses: 2K number of indirect IPv6 unicast routes: 1K number of IPv4 policy based routing aces: 0 number of IPv4/MAC qos aces: 0.5K number of IPv4/MAC security aces: 1K number of IPv6 policy based routing aces: 0 number of IPv6 qos aces: 0.625k number of IPv6 security aces: 0.5K Anything in Cisco land that can hold two full tables in hardware and can do line rate is going to be hideously expensive. ~Seth
Current thread:
- Re: Failover how much complexity will it add?, (continued)
- Re: Failover how much complexity will it add? adel (Nov 08)
- RE: Failover how much complexity will it add? John.Herbert (Nov 08)
- Re: Failover how much complexity will it add? adel (Nov 08)
- Re: Failover how much complexity will it add? adel (Nov 09)
- Re: Failover how much complexity will it add? Joe Greco (Nov 09)
- Re: Failover how much complexity will it add? adel (Nov 09)
- Re: Failover how much complexity will it add? adel (Nov 09)
- Re: Failover how much complexity will it add? adel (Nov 09)
- Re: Failover how much complexity will it add? Joe Greco (Nov 09)
- Re: Failover how much complexity will it add? adel (Nov 09)
- Re: Failover how much complexity will it add? Seth Mattinen (Nov 09)
- Re: Failover how much complexity will it add? Stef Walter (Nov 10)
- Re: Failover how much complexity will it add? Joel Jaeggli (Nov 10)
- Re: Failover how much complexity will it add? Randy Bush (Nov 10)
- Re: Failover how much complexity will it add? Joel Jaeggli (Nov 12)
- Re: Failover how much complexity will it add? adel (Nov 08)
- RE: Failover how much complexity will it add? Holmes,David A (Nov 09)
- Re: Failover how much complexity will it add? Joe Greco (Nov 09)
- Re: Failover how much complexity will it add? Brad Fleming (Nov 10)